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Bipedalism
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"Bipedality" redirects here. For the film, see Bipedality (film).
An ostrich, the fastest extant biped[1] at 70 km/h (43 mph)[2][a]
A Man Running - Eadweard Muybridge
Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs. An animal or machine that usually moves in a bipedal manner is known as a biped /ˈbaɪpɛd/, meaning "two feet" (from the Latin bis for "double" and pes for "foot"). Types of bipedal movement include walking, running, or hopping.
Few modern species are habitual bipeds whose normal method of locomotion is two-legged. Within mammals, habitual bipedalism has evolved multiple times, with the macropods, kangaroo rats and mice, springhare,[4] hopping mice, pangolins and homininan apes (australopithecines and humans) well as various other extinct groups evolving the trait independently. In the Triassic period some groups of archosaurs (a group that includes the ancestors of crocodiles) developed bipedalism; among their descendants the dinosaurs, all the early forms and many later groups were habitual or exclusive bipeds; the birds descended from one group of exclusively bipedal dinosaurs.
A larger number of modern species intermittently or briefly use a bipedal gait. Several lizard species move bipedally when running, usually to escape from threats. Many primate and bear species will adopt a bipedal gait in order to reach food or explore their environment. Several arboreal primate species, such as gibbons and indriids, exclusively walk on two legs during the brief periods they spend on the ground. Many animals rear up on their hind legs whilst fighting or copulating. Some animals commonly stand on their hind legs, in order to reach food, to keep watch, to threaten a competitor or predator, or to pose in courtship, but do not move bipedally.
Contents
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1 Etymology
2 Advantages
3 Facultative and obligate bipedalism
4 Movement
5 Bipedal animals
5.1 Amphibians
5.2 Extant reptiles
5.2.1 Early reptiles and lizards
5.3 Archosaurs (includes birds, crocodiles, and dinosaurs)
5.3.1 Birds
5.3.2 Other archosaurs
5.4 Mammals
5.4.1 Primates
6 Limited bipedalism
6.1 Limited bipedalism in mammals
6.2 Limited bipedalism in non-mammals
7 Evolution of human bipedalism
7.1 Multiple factors
7.2 Savanna-based theory
7.3 Traveling efficiency hypothesis
7.4 Postural feeding hypothesis
7.5 Provisioning model
7.6 Early bipedalism in homininae model
7.7 Warning display (aposematic) model
7.8 Other behavioural models
7.9 Thermoregulatory model
7.10 Carrying models
7.11 Wading models
7.12 Consequences
8 Physiology
8.1 Biomechanics
8.1.1 Standing
8.1.2 Shoulder stability
8.1.3 Walking
8.1.4 Running
8.2 Musculature
8.3 Respiration
9 Bipedal robots
10 See also
11 Notes
12 References
13 Further reading
14 External links
Etymology[edit]
The word is derived from the Latin words bi(s) 'two' and ped- 'foot', as contrasted with quadruped 'four feet'.
Advantages[edit]
Limited and exclusive bipedalism can offer a species several advantages. Bipedalism raises the head; this allows a greater field of vision with improved detection of distant dangers or resources, access to deeper water for wading animals and allows the animals to reach higher food sources with their mouths. While upright, non-locomotory limbs become free for other uses, including manipulation (in primates and rodents), flight (in birds), digging (in giant pangolin), combat (in bears, great apes and the large monitor lizard) or camouflage (in certain species of octopus). The maximum bipedal speed appears less fast than the maximum speed of quadrupedal movement with a flexible backbone – both the ostrich and the red kangaroo can reach speeds of 70 km/h (43 mph), while the cheetah can exceed 100 km/h (62 mph).[5][6] Even though bipedalism is slower at first, over long distances, it has allowed humans to outrun most other animals according to the endurance running hypothesis.[7] Bipedality in kangaroo rats has been hypothesized to improve locomotor performance, [clarification needed] which could aid in escaping from predators.[8][9]
Facultative and obligate bipedalism[edit]
Zoologists often label behaviors, including bipedalism, as "facultative" (i.e. optional) or "obligate" (the animal has no reasonable alternative). Even this distinction is not completely clear-cut — for example, humans other than infants normally walk and run in biped fashion, but almost all can crawl on hands and knees when necessary. There are even reports of humans who normally walk on all fours with their feet but not their knees on the ground, but these cases are a result of conditions such as Uner Tan syndrome — very rare genetic neurological disorders rather than normal behavior.[10] Even if one ignores exceptions caused by some kind of injury or illness, there are many unclear cases, including the fact that "normal" humans can crawl on hands and knees. This article therefore avoids the terms "facultative" and "obligate", and focuses on the range of styles of locomotion normally used by various groups of animals.
Movement[edit]
There are a number of states of movement commonly associated with bipedalism.
Standing. Staying still on both legs. In most bipeds this is an active process, requiring constant adjustment of balance.
Walking. One foot in front of another, with at least one foot on the ground at any time.
Running. One foot in front of another, with periods where both feet are off the ground.
Jumping/hopping. Moving by a series of jumps with both feet moving together.
Bipedal animals[edit]
The great majority of living terrestrial vertebrates are quadrupeds, with bipedalism exhibited by only a handful of living groups. Humans, gibbons and large birds walk by raising one foot at a time. On the other hand, most macropods, smaller birds, lemurs and bipedal rodents move by hopping on both legs simultaneously. Tree kangaroos are able to walk or hop, most commonly alternating feet when moving arboreally and hopping on both feet simultaneously when on the ground.
Amphibians[edit]
There are no known living or fossil bipedal amphibians.
Extant reptiles[edit]
Many species of lizards become bipedal during high-speed, sprint locomotion, including the world's fastest lizard, the spiny-tailed iguana (genus Ctenosaura).
Early reptiles and lizards[edit]
The first known biped is the bolosaurid Eudibamus whose fossils date from 290 million years ago.[11][12] Its long hindlegs, short forelegs, and distinctive joints all suggest bipedalism. The species became extinct in the early Permian.
Archosaurs (includes birds, crocodiles, and dinosaurs)[edit]
Birds[edit]
All birds are bipeds when on the ground, a feature inherited from their dinosaur ancestors.
Other archosaurs[edit]
Bipedalism evolved more than once in archosaurs, the group that includes both dinosaurs and crocodilians.[13] All dinosaurs are thought to be descended from a fully bipedal ancestor, perhaps similar to Eoraptor. Bipedal movement also re-evolved in a number of other dinosaur lineages such as the iguanodons. Some extinct members of the crocodilian line, a sister group to the dinosaurs and birds, also evolved bipedal forms - a crocodile relative from the triassic, Effigia okeeffeae, is thought to be bipedal.[14] Pterosaurs were previously thought to have been bipedal, but recent trackways have all shown quadrupedal locomotion. Bipedalism also evolved independently among the dinosaurs. Dinosaurs diverged from their archosaur ancestors approximately 230 million years ago during the Middle to Late Triassic period, roughly 20 million years after the Permian-Triassic extinction event wiped out an estimated 95% of all life on Earth.[15][16] Radiometric dating of fossils from the early dinosaur genus Eoraptor establishes its presence in the fossil record at this time. Paleontologists suspect Eoraptor resembles the common ancestor of all dinosaurs;[17] if this is true, its traits suggest that the first dinosaurs were small, bipedal predators.[18] The discovery of primitive, dinosaur-like ornithodirans such as Marasuchus and Lagerpeton in Argentinian Middle Triassic strata supports this view; analysis of recovered fossils suggests that these animals were indeed small, bipedal predators.
Mammals[edit]
A number of groups of extant mammals have independently evolved bipedalism as their main form of locomotion - for example humans, giant pangolins, the extinct giant ground sloths, numerous species of jumping rodents and macropods. Humans, as their bipedalism has been extensively studied, are documented in the next section. Macropods are believed to have evolved bipedal hopping only once in their evolution, at some time no later than 45 million years ago.[19] Bipedal movement is less common among mammals, most of which are quadrupedal. All primates possess some bipedal ability, though most species primarily use quadrupedal locomotion on land. Primates aside, the macropods (kangaroos, wallabies and their relatives), kangaroo rats and mice, hopping mice and springhare move bipedally by hopping. Very few mammals other than primates commonly move bipedally by an alternating gait rather than hopping. Exceptions are the ground pangolin and in some circumstances the tree kangaroo.[20] One black bear, Pedals, became famous locally and on the internet for having a frequent bipedal gait, although this is attributed to injuries on the bear's front paws.
Primates[edit]
Most bipedal animals move with their backs close to horizontal, using a long tail to balance the weight of their bodies. The primate version of bipedalism is unusual because the back is close to upright (completely upright in humans). Many primates can stand upright on their hind legs without any support. Chimpanzees, bonobos, gibbons[21] and baboons[22] exhibit forms of bipedalism. On the ground sifakas move like all indrids with bipedal sideways hopping movements of the hind legs, holding their forelimbs up for balance.[23] Geladas, although usually quadrupedal, will sometimes move between adjacent feeding patches with a squatting, shuffling bipedal form of locomotion.[24]
The evolution of human bipedalism began in primates about four million years ago,[25] or as early as seven million years ago with Sahelanthropus.[26] One hypothesis for human bipedalism is that it evolved as a result of differentially successful survival from carrying food to share with group members,[27] although there are alternative hypotheses.
Injured individuals
Injured chimpanzees and bonobos have been capable of sustained bipedalism.[28]
Three captive primates, one macaque Natasha[29] and two chimps, Oliver and Poko (chimpanzee), were found to move bipedally [clarification needed]. Natasha switched to exclusive bipedalism after an illness, while Poko was discovered in captivity in a tall, narrow cage.[30][31] Oliver reverted to knuckle-walking after developing arthritis. Non-human primates often use bipedal locomotion when carrying food.
Limited bipedalism[edit]
Limited bipedalism in mammals[edit]
Other mammals engage in limited, non-locomotory, bipedalism. A number of other animals, such as rats, raccoons, and beavers will squat on their hindlegs to manipulate some objects but revert to four limbs when moving (the beaver will move bipedally if transporting wood for their dams, as will the raccoon when holding food). Bears will fight in a bipedal stance to use their forelegs as weapons. A number of mammals will adopt a bipedal stance in specific situations such as for feeding or fighting. Ground squirrels and meerkats will stand on hind legs to survey their surroundings, but will not walk bipedally. Dogs (e.g. Faith) can stand or move on two legs if trained, or if birth defect or injury precludes quadrupedalism. The gerenuk antelope stands on its hind legs while eating from trees, as did the extinct giant ground sloth and chalicotheres. The spotted skunk will walk on its front legs when threatened, rearing up on its front legs while facing the attacker so that its anal glands, capable of spraying an offensive oil, face its attacker.
Limited bipedalism in non-mammals[edit]
Bipedalism is unknown among the amphibians. Among the non-archosaur reptiles bipedalism is rare, but it is found in the 'reared-up' running of lizards such as agamids and monitor lizards. Many reptile species will also temporarily adopt bipedalism while fighting.[32] One genus of basilisk lizard can run bipedally across the surface of water for some distance. Among arthropods, cockroaches are known to move bipedally at high speeds.[33] Bipedalism is rarely found outside terrestrial animals, though at least two types of octopus walk bipedally on the sea floor using two of their arms, allowing the remaining arms to be used to camouflage the octopus as a mat of algae or a floating coconut.[34]
Evolution of human bipedalism[edit]
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Main article: Human skeletal changes due to bipedalism
There are at least twelve distinct hypotheses as to how and why bipedalism evolved in humans, and also some debate as to when. Bipedalism evolved well before the large human brain or the development of stone tools.[35] Bipedal specializations are found in Australopithecus fossils from 4.2-3.9 million years ago,[36] although Sahelanthropus may have walked on two legs as early as seven million years ago.[26] Nonetheless, the evolution of bipedalism was accompanied by significant evolutions in the spine including the forward movement in position of the foramen magnum, where the spinal cord leaves the cranium.[37] Recent evidence regarding modern human sexual dimorphism (physical differences between male and female) in the lumbar spine has been seen in pre-modern primates such as Australopithecus africanus. This dimorphism has been seen as an evolutionary adaptation of females to bear lumbar load better during pregnancy, an adaptation that non-bipedal primates would not need to make.[38][39] Adapting bipedalism would have required less shoulder stability, which allowed the shoulder and other limbs to become more independent of each other and adapt for specific suspensory behaviors. In addition to the change in shoulder stability, changing locomotion would have increased the demand for shoulder mobility, which would have propelled the evolution of bipedalism forward.[40] The different hypotheses are not necessarily mutually exclusive and a number of selective forces may have acted together to lead to human bipedalism. It is important to distinguish between adaptations for bipedalism and adaptations for running, which came later still.
Numerous causes for the evolution of human bipedalism involve freeing the hands for carrying and using tools, sexual dimorphism in provisoning, changes in climate and environment (from jungle to savanna) that favored a more elevated eye-position, and to reduce the amount of skin exposed to the tropical sun.[41] It is possible that bipedalism provided a variety of benefits to the hominin species, and scientists have suggested multiple reasons for evolution of human bipedalism.[42] There also is not only question of why were the earliest hominins partially bipedal but also why did hominins become more bipedal over time. For example, the postural feeding hypothesis explains for how earliest hominins became for the benefit of reaching out for food in trees while the savanna-based theory describes how the late hominins that started to settle on the ground became increasingly bipedal.[43]
Multiple factors[edit]
Napier (1963) argued that it was very unlikely that a single factor drove the evolution of Bipedalism. He stated "It seems unlikely that any single factor was responsible for such a dramatic change in behaviour. In addition to the advantages of accruing from ability to carry objects - food or otherwise - the improvement of the visual range and the freeing of the hands for purposes of defence and offence must equally have played their part as catalysts.” [44] Sigmon argued that chimpanzees demonstrate bipedalism in different contexts, and one single factor should be used to explain bipedalism: preadaptation for human bipedalism.[45] Day (1986) emphasized three major pressures that drove evolution of bipedalism 1.food acquisition 2. predator avoidance 3. Reproductive success.[46] Ko (2015) states there are two questions regarding bipedalism 1. Why were the earliest hominins partially bipedal 2. why did hominins become more bipedal over time. He argues that these questions can be answered with combination of prominent theories such as Savanna-based, Postural feeding, and Provisioning.[47]
Savanna-based theory[edit]
Main article: Savannah hypothesis
According to the Savanna-based theory, hominines descended from the trees and adapted to life on the savanna by walking erect on two feet. The theory suggests that early hominids were forced to adapt to bipedal locomotion on the open savanna after they left the trees. This theory is closely related to the knuckle-walking hypothesis, which states that human ancestors used quadrupedal locomotion on the savanna, as evidenced by morphological characteristics found in Australopithecus anamensis and Australopithecus afarensis forelimbs, and that it is less parsimonious to assume that knuckle walking developed twice in genera Pan and Gorilla instead of evolving it once as synapomorphy for Pan and Gorilla before losing it in Australopithecus.[48] The evolution of an orthograde posture would have been very helpful on a savanna as it would allow the ability to look over tall grasses in order to watch out for predators, or terrestrially hunt and sneak up on prey.[49] It was also suggested in P.E. Wheeler's "The evolution of bipedality and loss of functional body hair in hominids", that a possible advantage of bipedalism in the savanna was reducing the amount of surface area of the body exposed to the sun, helping regulate body temperature.[50] In fact, Elizabeth Vrba’s turnover pulse hypothesis supports the savanna-based theory by explaining the shrinking of forested areas due to global warming and cooling, which forced animals out into the open grasslands and caused the need for hominids to acquire bipedality.[51]
Rather, the bipedal adaptation hominines had already achieved was used in the savanna. The fossil evidence reveals that early bipedal hominins were still adapted to climbing trees at the time they were also walking upright.[52] It is possible that Bipedalism evolved in the trees, and was later applied to the savanna as a vestigial trait. Humans and orangutans are both unique to a bipedal reactive adaptation when climbing on thin branches, in which they have increased hip and knee extension in relation to the diameter of the branch, which can increase an arboreal feeding range and can be attributed to a convergent evolution of bipedalism evolving in arboreal environments.[53] Hominine fossils found in dry grassland environments led anthropologists to believe hominines lived, slept, walked upright, and died only in those environments because no hominine fossils were found in forested areas. However, fossilization is a rare occurrence—the conditions must be just right in order for an organism that dies to become fossilized for somebody to find later, which is also a rare occurrence. The fact that no hominine fossils were found in forests does not ultimately lead to the conclusion that no hominines ever died there. The convenience of the savanna-based theory caused this point to be overlooked for over a hundred years.[54]
Some of the fossils found actually showed that there was still an adaptation to arboreal life. For example, Lucy, the famous Australopithecus afarensis, found in Hadar in Ethiopia, which may have been forested at the time of Lucy’s death, had curved fingers that would still give her the ability to grasp tree branches, but she walked bipedally. “Little Foot,” a nearly-complete specimen of Australopithecus africanus, has a divergent big toe as well as the ankle strength to walk upright. “Little Foot” could grasp things using his feet like an ape, perhaps tree branches, and he was bipedal. Ancient pollen found in the soil in the locations in which these fossils were found suggest that the area used to be much more wet and covered in thick vegetation and has only recently become the arid desert it is now.[51]
Traveling efficiency hypothesis[edit]
An alternative explanation is the mixture of savanna and scattered forests increased terrestrial travel by proto-humans between clusters of trees, and bipedalism offered greater efficiency for long-distance travel between these clusters than quadrupedalism.[55][56] In an experiment monitoring chimpanzee metabolic rate via oxygen consumption, it was found that the quadrupedal and bipedal energy costs were very similar, implying that this transition in early ape-like ancestors would have not have been very difficult or energetically costing.[57] This increased travel efficiency is likely to have been selected for as it assisted the wide dispersal of early hominids across the savanna to create start populations.
Postural feeding hypothesis[edit]
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The postural feeding hypothesis has been recently supported by Dr. Kevin Hunt, a professor at Indiana University.[58] This hypothesis asserts that chimpanzees were only bipedal when they eat. While on the ground, they would reach up for fruit hanging from small trees and while in trees, bipedalism was used to reach up to grab for an overhead branch. These bipedal movements may have evolved into regular habits because they were so convenient in obtaining food. Also, Hunt's hypotheses states that these movements coevolved with chimpanzee arm-hanging, as this movement was very effective and efficient in harvesting food. When analyzing fossil anatomy, Australopithecus afarensis has very similar features of the hand and shoulder to the chimpanzee, which indicates hanging arms. Also, the Australopithecus hip and hind limb very clearly indicate bipedalism, but these fossils also indicate very inefficient locomotive movement when compared to humans. For this reason, Hunt argues that bipedalism evolved more as a terrestrial feeding posture than as a walking posture.(https://www.researchgate.net/publication/288349918_The_postural_feeding_hypothesis_An_ecological_model_for_the_evolution_of_bipedalism)
A similar study conducted by Thorpe et al. looked at how the most arboreal great ape, the orangutan, held onto supporting branches in order to navigate branches that were too flexible or unstable otherwise. They found that in more than 75% of locomotive instances the orangutans used their hands to stabilize themselves while they navigated thinner branches. They hypothesized that increased fragmentation of forests where A. afarensis as well as other ancestors of modern humans and other apes resided could have contributed to this increase of bipedalism in order to navigate the diminishing forests. Their findings also shed light on a couple of discrepancies observed in the anatomy of A. afarensis, such as the ankle joint, which allowed it to “wobble” and long, highly flexible forelimbs. The idea that bipedalism started from walking in trees explains both the increased flexibility in the ankle as well as the long limbs which would be used to grab hold of branches.
Provisioning model[edit]
One theory on the origin of bipedalism is the behavioral model presented by C. Owen Lovejoy, known as "male provisioning".[59] Lovejoy theorizes that the evolution of bipedalism was linked to monogamy. In the face of long inter-birth intervals and low reproductive rates typical of the apes, early hominids engaged in pair-bonding that enabled greater parental effort directed towards rearing offspring. Lovejoy proposes that male provisioning of food would improve the offspring survivorship and increase the pair's reproductive rate. Thus the male would leave his mate and offspring to search for food and return carrying the food in his arms walking on his legs. This model is supported by the reduction ("feminization") of the male canine teeth in early hominids such as Sahelanthropus tchadensis[60] and Ardipithecus ramidus,[61] which along with low body size dimorphism in Ardipithecus[62] and Australopithecus,[63] suggests a reduction in inter-male antagonistic behavior in early hominids.[64] In addition, this model is supported by a number of modern human traits associated with concealed ovulation (permanently enlarged breasts, lack of sexual swelling) and low sperm competition (moderate sized testes, low sperm mid-piece volume) that argues against recent adaptation to a polygynous reproductive system.[64]
However, this model has generated some controversy, as others have argued that early bipedal hominids were instead polygynous. Among most monogamous primates, males and females are about the same size. That is sexual dimorphism is minimal, and other studies have suggested that Australopithecus afarensis males were nearly twice the weight of females. However, Lovejoy's model posits that the larger range a provisioning male would have to cover (to avoid competing with the female for resources she could attain herself) would select for increased male body size to limit predation risk.[65] Furthermore, as the species became more bipedal, specialized feet would prevent the infant from conveniently clinging to the mother - hampering the mother's freedom[66] and thus make her and her offspring more dependent on resources collected by others. Modern monogamous primates such as gibbons tend to be also territorial, but fossil evidence indicates that Australopithecus afarensis lived in large groups. However, while both gibbons and hominids have reduced canine sexual dimorphism, female gibbons enlarge ('masculinize') their canines so they can actively share in the defense of their home territory. Instead, the reduction of the male hominid canine is consistent with reduced inter-male aggression in a group living primate.
Early bipedalism in homininae model[edit]
Recent studies of 4.4 million years old Ardipithecus ramidus suggest bipedalism, it is thus possible that bipedalism evolved very early in homininae and was reduced in chimpanzee and gorilla when they became more specialized. According to Richard Dawkins in his book "The Ancestor's Tale", chimps and bonobos are descended from Australopithecus gracile type species while gorillas are descended from Paranthropus. These apes may have once been bipedal, but then lost this ability when they were forced back into an arboreal habitat, presumably by those australopithecines from whom eventually evolved hominins. Early homininaes such as Ardipithecus ramidus may have possessed an arboreal type of bipedalism that later independently evolved towards knuckle-walking in chimpanzees and gorillas[67] and towards efficient walking and running in modern humans (see figure). It is also proposed that one cause of Neanderthal extinction was a less efficient running.
Warning display (aposematic) model[edit]
Joseph Jordania from the University of Melbourne recently (2011) suggested that bipedalism was one of the central elements of the general defense strategy of early hominids, based on aposematism, or warning display and intimidation of potential predators and competitors with exaggerated visual and audio signals. According to this model, hominids were trying to stay as visible and as loud as possible all the time. Several morphological and behavioral developments were employed to achieve this goal: upright bipedal posture, longer legs, long tightly coiled hair on the top of the head, body painting, threatening synchronous body movements, loud voice and extremely loud rhythmic singing/stomping/drumming on external subjects.[68] Slow locomotion and strong body odor (both characteristic for hominids and humans) are other features often employed by aposematic species to advertise their non-profitability for potential predators.
Other behavioural models[edit]
There are a variety of ideas which promote a specific change in behaviour as the key driver for the evolution of hominid bipedalism. For example, Wescott (1967) and later Jablonski & Chaplin (1993) suggest that bipedal threat displays could have been the transitional behaviour which led to some groups of apes beginning to adopt bipedal postures more often. Others (e.g. Dart 1925) have offered the idea that the need for more vigilance against predators could have provided the initial motivation. Dawkins (e.g. 2004) has argued that it could have begun as a kind of fashion that just caught on and then escalated through sexual selection. And it has even been suggested (e.g. Tanner 1981:165) that male phallic display could have been the initial incentive, as well as increased sexual signaling in upright female posture.[49]
Thermoregulatory model[edit]
The thermoregulatory model explaining the origin of bipedalism is one of the simplest theories so far advanced, but it is a viable explanation. Dr. Peter Wheeler, a professor of evolutionary biology, proposes that bipedalism raises the amount of body surface area higher above the ground which results in a reduction in heat gain and helps heat dissipation.[69][70][71] When a hominid is higher above the ground, the organism accesses more favorable wind speeds and temperatures. During heat seasons, greater wind flow results in a higher heat loss, which makes the organism more comfortable. Also, Wheeler explains that a vertical posture minimizes the direct exposure to the sun whereas quadrupedalism exposes more of the body to direct exposure. Analysis and interpretations of Ardipithecus reveal that this hypothesis needs modification to consider that the forest and woodland environmental preadaptation of early-stage hominid bipedalism preceded further refinement of bipedalism by the pressure of natural selection. This then allowed for the more efficient exploitation of the hotter conditions ecological niche, rather than the hotter conditions being hypothetically bipedalism's initial stimulus. A feedback mechanism from the advantages of bipedality in hot and open habitats would then in turn make a forest preadaptation solidify as a permanent state.[72]
Carrying models[edit]
Charles Darwin wrote that "Man could not have attained his present dominant position in the world without the use of his hands, which are so admirably adapted to the act of obedience of his will". Darwin (1871:52) and many models on bipedal origins are based on this line of thought. Gordon Hewes (1961) suggested that the carrying of meat "over considerable distances" (Hewes 1961:689) was the key factor. Isaac (1978) and Sinclair et al. (1986) offered modifications of this idea, as indeed did Lovejoy (1981) with his "provisioning model" described above. Others, such as Nancy Tanner (1981), have suggested that infant carrying was key, while others again have suggested stone tools and weapons drove the change.[73] This stone-tools theory is very unlikely, as though ancient humans were known to hunt, the discovery of tools was not discovered for thousands of years after the origin of bipedalism, chronologically precluding it from being a driving force of evolution. (Wooden tools and spears fossilize poorly and therefore it is difficult to make a judgment about their potential usage.)
Wading models[edit]
The observation that large primates, including especially the great apes, that predominantly move quadrupedally on dry land, tend to switch to bipedal locomotion in waist deep water, has led to the idea that the origin of human bipedalism may have been influenced by waterside environments. This idea, labelled "the wading hypothesis",[74] was originally suggested by the Oxford marine biologist Alister Hardy who said: "It seems to me likely that Man learnt to stand erect first in water and then, as his balance improved, he found he became better equipped for standing up on the shore when he came out, and indeed also for running."[75] It was then promoted by Elaine Morgan, as part of the aquatic ape hypothesis, who cited bipedalism among a cluster of other human traits unique among primates, including voluntary control of breathing, hairlessness and subcutaneous fat.[76] The "aquatic ape hypothesis", as originally formulated, has not been accepted or considered a serious theory within the anthropological scholarly community.[77] Others, however, have sought to promote wading as a factor in the origin of human bipedalism without referring to further ("aquatic ape" related) factors. Since 2000 Carsten Niemitz has published a series of papers and a book[78] on a variant of the wading hypothesis, which he calls the "amphibian generalist theory" (German: Amphibische Generalistentheorie).
Other theories have been proposed that suggest wading and the exploitation of aquatic food sources (providing essential nutrients for human brain evolution[79] or critical fallback foods[80]) may have exerted evolutionary pressures on human ancestors promoting adaptations which later assisted full-time bipedalism. It has also been thought that consistent water-based food sources had developed early hominid dependency and facilitated dispersal along seas and rivers.[81]
Consequences[edit]
During the hominin’s early evolution, brains became larger, due to increased intelligence, and bipedalism became the norm. The consequences of these two changes in particular resulted in painful and difficult labor due to the increased favor of a narrow pelvis for bipedalism being countered by larger heads passing through the constricted birth canal. This phenomenon is commonly known as the obstetrical dilemma.
Physiology[edit]
Bipedal movement occurs in a number of ways, and requires many mechanical and neurological adaptations. Some of these are described below.
Biomechanics[edit]
Standing[edit]
Energy-efficient means of standing bipedally involve constant adjustment of balance, and of course these must avoid overcorrection. The difficulties associated with simple standing in upright humans are highlighted by the greatly increased risk of falling present in the elderly, even with minimal reductions in control system effectiveness.
Shoulder stability[edit]
Shoulder stability would decrease with the evolution of bipedalism. Shoulder mobility would increase because the need for a stable shoulder is only present in arboreal habitats. Shoulder mobility would support suspensory locomotion behaviors which are present in human bipedalism. The forelimbs are freed from weight bearing capabilities which makes the shoulder a place of evidence for the evolution of bipedalism.[82]
Walking[edit]
Walking is characterized by an "inverted pendulum" movement in which the center of gravity vaults over a stiff leg with each step.[83] Force plates can be used to quantify the whole-body kinetic & potential energy, with walking displaying an out-of-phase relationship indicating exchange between the two.[83] Interestingly, this model applies to all walking organisms regardless of the number of legs, and thus bipedal locomotion does not differ in terms of whole-body kinetics.[84]
In humans, walking is composed of several separate processes:[83]
Vaulting over a stiff stance leg
Passive ballistic movement of the swing leg
A short 'push' from the ankle prior to toe-off, propelling the swing leg
Rotation of the hips about the axis of the spine, to increase stride length
Rotation of the hips about the horizontal axis to improve balance during stance
Running[edit]
Running is characterized by a spring-mass movement.[83] Kinetic and potential energy are in phase, and the energy is stored & released from a spring-like limb during foot contact.[83] Again, the whole-body kinetics are similar to animals with more limbs.[84]
Musculature[edit]
Bipedalism requires strong leg muscles, particularly in the thighs. Contrast in domesticated poultry the well muscled legs, against the small and bony wings. Likewise in humans, the quadriceps and hamstring muscles of the thigh are both so crucial to bipedal activities that each alone is much larger than the well-developed biceps of the arms.
Respiration[edit]
A biped has the ability to breathe while running, without strong coupling to stride cycle. Humans usually take a breath every other stride when their aerobic system is functioning. During a sprint the anaerobic system kicks in and breathing slows until the anaerobic system can no longer sustain a sprint.
Bipedal robots[edit]
Main articles: Humanoid robot and Chicken walker
ASIMO - a bipedal robot
For nearly the whole of the 20th century, bipedal robots were very difficult to construct and robot locomotion involved only wheels, treads, or multiple legs. Recent cheap and compact computing power has made two-legged robots more feasible. Some notable biped robots are ASIMO, HUBO, MABEL and QRIO. Recently, spurred by the success of creating a fully passive, un-powered bipedal walking robot,[85] those working on such machines have begun using principles gleaned from the study of human and animal locomotion, which often relies on passive mechanisms to minimize power consumption.
See also[edit]
Allometry
Orthograde posture
Quadrupedalism
Notes[edit]
Jump up ^ The red kangaroo can attain a similar speed for short distances.[3]
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Further reading[edit]
Darwin, C., "The Descent of Man and Selection in Relation to Sex", Murray (London), (1871).
Dart, R.A., "Australopithecus africanus: The Ape Man of South Africa" Nature, 145, 195-199, (1925).
Dawkins, R., "The Ancestor's Tale", Weidenfeld and Nicolson (London), (2004).
Hewes, G.W., "Food Transport and the Origin of Hominid Bipedalism" American Anthropologist, 63, 687-710, (1961).
Hunt, K.D., "The Evolution of Human Bipedality" Journal of Human Evolution, 26, 183-202, (1994).
Isaac, G.I., "The Archeological Evidence for the Activities of Early African Hominids" In:Early Hominids of Africa (Jolly, C.J. (Ed.)), Duckworth (London), 219-254, (1978).
Jablonski, N.G.; Chaplin, G. (1993). "Origin of Habitual Terrestrial Bipedalism in the Ancestor of the Hominidae". Journal of Human Evolution. 24: 259–280. doi:10.1006/jhev.1993.1021.
Lovejoy, C. O. (1981). "The Origin of Man". Science. 211 (4480): 341–350. Bibcode:1981Sci...211..341L. doi:10.1126/science.211.4480.341. PMID 17748254.
Tanner, N.M., "On Becoming Human", Cambridge University Press (Cambridge), (1981)
Wescott, R.W. (1967). "Hominid Uprightness and Primate Display". American Anthropologist. 69: 738. doi:10.1525/aa.1967.69.6.02a00110.
Wheeler, P. E. (1984) "The Evolution of Bipedality and Loss of Functional Body Hair in Hominoids." Journal of Human Evolution, 13, 91-98,
Vrba, E. (1993). "The Pulse that Produced Us". Natural History. 102 (5): 47–51.
External links[edit]
The Origin of Bipedalism
Human Timeline (Interactive) – Smithsonian, National Museum of Natural History (August 2016).
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Eleanor (automobile)
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Eleanor
Original 1971 Mustang Sportsroof (restyled as 1973) Eleanor from the original 1974 film Gone in 60 Seconds
Overview
Manufacturer
Ford
Body and chassis
Class
Pony car/Muscle car
Body style
2-door fastback
"Eleanor" is a customized 1971 Ford Mustang Sportsroof (redressed as 1973[1][2]) that features in independent filmmaker H.B. "Toby" Halicki's 1974 film Gone in 60 Seconds. "Eleanor" is the only Ford Mustang in history to receive star title credit in a movie.[citation needed]
The Eleanor name is reused for a Shelby Mustang GT500 in the 2000 Gone in 60 Seconds remake.
Contents
[hide]
1 Eleanor - 1974 film
1.1 Prepping the two 1971 Mustangs for the film
1.2 Stunt Eleanor
1.2.1 Additional history
1.3 Beauty Eleanor
1.4 Plates worn in the film
1.4.1 California
1.4.2 New York
2 Eleanor - 2000 film
3 Screen-used vehicles
3.1 License plate numbers
3.1.1 California
4 References
5 External links
Eleanor - 1974 film[edit]
Though four Mustangs are portrayed in the film as "Eleanor" targets, only two cars were used for filming the movie, with license plates and tires alternated as necessary. Of these two, one car was modified for the stunt driving necessitated by the final chase and wrecked in said process, while the other was kept intact for all external "beauty shots." The latter car was also used for all but two interior shots.[3]
Prepping the two 1971 Mustangs for the film[edit]
Both 1971 Mustang Sportsroofs used in the film (neither car has been proven to be a Mach 1, as often assumed) were bought in 1971, but - as it was three years before Halicki could raise sufficient funds to start filming - each car was facelifted with 1973 grilles for the film. Both cars retain their 1971 front bumper and valance panels, as retrofitting the 1973 parts to the car would have required swapping the fenders as well.[4]
As with the liberties taken with the body modifications, Halicki's paint scheme on both cars were similar - but not identical - to Ford factory offerings. Both cars received blackout treatment to the lower bodyside - resembling Mach 1's and base models equipped with the Exterior Decor Group - and a unique blackout treatment to the standard hood; not seen on any factory 1971-1973 Mustang. Additionally, neither car wears any identifiable badging spelling the "Mustang" name in type, though the pony badge and "Ford Motor Company" hubcaps are visible in the film.[5]
Despite rumors that both cars were painted in Ford's Medium Yellow Gold, Halicki - in a 1974 interview - stated that the cars were painted "generic school bus yellow" to save money.[6]
Stunt Eleanor[edit]
The modified car required 250 hours of labor before it was ready for the film.[7] All body panels were removed[8] in order to install a roll cage throughout the Mustang's stock unibody. The transmission was also chained in for safety. An adjustable camera rig was mounted in the back seat to capture footage from the internal “driver's point of view.”
The wrecked Eleanor was equipped with a base interior and no instrumentation package, but utilized seats from the Mustang's deluxe interior package; sourced from the beauty car. Conversely, the beauty car had deluxe interior, with the standard seats from the stunt car swapped into it.
Other safety modifications included:[9]
Heavy duty Simpson shoulder harness
Deadbolt door locks
Aftermarket hood pins
24-volt electrical system
On-board first-aid kit
Electrical kill switches
Individual locking rear brakes[10]
Fish plating of the undercarriage - 3” x 3/8” steel
The interior of the stunt car is seen only once in the film, when Halicki - as Maindrian Pace - places his hands against the windshield when cornered by the Long Beach police. The rollcage is clearly visible against the A-pillar. All other interior shots were executed with the "beauty" car, generally on alternate filming dates.
Additional history[edit]
The stunt car survives to this day,[11] despite two serious incidents during filming:
The first occurred during a stunt wherein "Eleanor" cuts across multiple lanes of freeway traffic. The stunt driver leading the "traffic" overshot his mark during the take, clipping the Mustang and causing it to careen into a nearby light pole. Halicki was rendered unconscious from the impact, but filming resumed the following week - utilizing this accident as part of the final film.[12] Halicki's first words - upon regaining consciousness - were "Did we get coverage?"[13]
Following the incident with the light pole, Halicki compressed multiple vertibrae after performing the impressive 128-foot jump in the closing minutes of the film. The modified Mustang survived, despite the rough nose landing.[14]
2007-2009 Classic Recreations manufactured Eleanor mustangs under license by Halicki Films/Eleanor Licensing. After two years Classic Recreations terminated the licensing agreement. Classic Recreations produced two models of the Eleanor Mustang (535 model,750 model).
Beauty Eleanor[edit]
The second car was left absolutely stock - as noted by cinematographer Jack Vacek in the film's DVD commentary - and was not modified extensively other than the obligatory matching paint job, grille change, and seat swap with the stunt car.
Though this car was not damaged during filming, Halicki stated (in 1974, at the film's premiere) that the car was crushed.[15]
Plates worn in the film[edit]
California[edit]
869 FLA
613 HSO (Airport Eleanor)
614 HSO (Hal McClain[16] Eleanor)
359 JRA
820 FUA (Eleanor at car wash)
New York[edit]
RMH 100 (Fake plates affixed to 820 FUA)
Eleanor - 2000 film[edit]
Custom 1967 Mustang Fastback Eleanor from the 2000 Gone in Sixty Seconds film
In 1995, Denice Halicki licensed the rights of the 1974 film to Disney for a remake of the same name. The new 2000 Gone in 60 Seconds film, produced by Jerry Bruckheimer, features Nicolas Cage as master auto thief Randall "Memphis" Raines. Both films share plot similarities about a crew of thieves who steal a large order of cars (48 in the original, 50 in the 2000 film) and deliver them to the Long Beach docks. Once again, the "Eleanor" name is given to the film's featured car; now a Dupont Pepper Grey 1967 Ford Mustang fastback, depicted as a Shelby GT500, with a customized body kit designed by Steve Stanford.[17]
Screen-used vehicles[edit]
Depending on the source, either eleven[18] or twelve[19] cars were built by Cinema Vehicle Services for the film (not including CVS's creation of one additional Eleanor clone - with a Ford 428 - for producer Bruckheimer).[20] Nine were shells, and three were built as fully functional vehicles.[21] Seven were reported to have "survived the filming [and] made it back to Cinema Vehicle Services" according to research by Mustangandfords.com.[22]
Of the surviving vehicles, three cars have been offered to the public with claims of originality and screen-use in the film, as follows:
Cinema Vehicle Services number[23]
VIN
Sales history
? 7R02S211287 Sold at Barrett-Jackson's 2009 Scottsdale, AZ auction for $216,700.[24]
7 7R02C173895 Sold at COYS Autosport International January 2012 auction (Birmingham, UK) for £95,000.[25] Later offered at Mecum's Austin, Texas auction on December 12, 2014; did not meet reserve at $380,000 USD.[26]
9 7R02C179710 Sold at Mecum's Indianapolis auction on May 18, 2013 for $1,000,000 USD. Touted as the "main" hero car in the film and used for promotional photographs.[27][28][29]
All three claim to be functional builds for the film.[30][31][32] Whether the two wrecked cars were rebuilt - or whether surviving shells were built up into functional cars - remains unknown and unpublicized.
A fourth car, VIN #7F02C229830, last offered for sale in Dubai, also claims originality to the film. This car has not been authenticated.[33][34]
License plate numbers[edit]
California[edit]
LYN 274
ELNOR 2
References[edit]
Jump up ^ http://www.gonein60seconds.com/elenor.htm
Jump up ^ http://www.imcdb.org/vehicle_4972-Ford-Mustang-1971.html
Jump up ^ http://www.imcdb.org/vehicle.php?id=4972#Comment1586093
Jump up ^ http://www.imcdb.org/vehicle_4972-Ford-Mustang-1971.html
Jump up ^ http://www.imcdb.org/vehicle_4972-Ford-Mustang-1971.html
Jump up ^ http://www.7173mustangs.com/thread-gone-in-60-seconds-1974-eleanor-observations-was-halicki-really-a-car-thief-etc?pid=177688#pid177688
Jump up ^ http://www.gonein60seconds.com/elenor.htm
Jump up ^ http://www.mustangmonthly.com/featuredvehicles/1305_gone_in_60_seconds/photo_03.html
Jump up ^ http://www.mustangspecs.com/movie/73eleanor.shtml
Jump up ^ https://www.youtube.com/watch?v=FMKqF-HuTLE
Jump up ^ http://www.mustangmonthly.com/featuredvehicles/1305_gone_in_60_seconds/photo_02.html
Jump up ^ http://www.mustangmonthly.com/featuredvehicles/1305_gone_in_60_seconds/picking_a_mustang.html
Jump up ^ http://www.imdb.com/title/tt0071571/trivia
Jump up ^ http://www.movie-locations.com/movies/g/Gone-In-60-Seconds-1974.html
Jump up ^ http://www.7173mustangs.com/thread-gone-in-60-seconds-1974-eleanor-observations-was-halicki-really-a-car-thief-etc?pid=177688#pid177688
Jump up ^ http://www.imdb.com/name/nm1183088/
Jump up ^ http://www.carscoops.com/2012/01/one-of-original-eleanor-mustang-gt500.html
Jump up ^ https://www.mecum.com/lot-detail.cfm?lot_id=AU1214-198955
Jump up ^ http://www.mustangandfords.com/featured-vehicles/173-0011-gone-60-seconds/photo-13.html
Jump up ^ http://www.mustangandfords.com/featured-vehicles/173-0011-gone-60-seconds/photo-14.html
Jump up ^ http://www.mustangandfords.com/featured-vehicles/173-0011-gone-60-seconds/photo-14.html
Jump up ^ http://www.mustangandfords.com/featured-vehicles/173-0011-gone-60-seconds/index1.html
Jump up ^ http://www.autocollections.com/index.cfm?id=172&action=details&tab=inventory&sortorder=car
Jump up ^ http://www.barrett-jackson.com/Events/Event/Details/1967-FORD-MUSTANG-ELEANOR---GONE-IN-60-SECONDS-71644
Jump up ^ http://67mustangblog.com/2012/01/original-gone-in-60-seconds-movie-car-to-go-under-the-hammer/
Jump up ^ https://www.mecum.com/lot-detail.cfm?lot_id=AU1214-198955
Jump up ^ http://www.roadandtrack.com/go/news/auctions/go-news-auctions-eleanor-sells-for-one-million-dollars
Jump up ^ http://www.autocollections.com/index.cfm?id=172&action=details&tab=inventory&sortorder=car
Jump up ^ http://67mustangblog.com/2013/04/another-eleanor-movie-car-to-be-auctioned-at-mecum/
Jump up ^ http://www.carscoops.com/2008/06/1967-ford-shelby-mustang-gt500-eleanor.html
Jump up ^ http://67mustangblog.com/2012/01/original-gone-in-60-seconds-movie-car-to-go-under-the-hammer/
Jump up ^ http://www.roadandtrack.com/go/news/auctions/go-news-auctions-eleanor-sells-for-one-million-dollars
Jump up ^ http://67mustangblog.com/2013/01/original-eleanor-movie-car-on-sale-in-dubai/
Jump up ^ http://www.dealsonwheels.ae/car-Ford-1642.html
External links[edit]
When Mustangs Become Movie Stars: The Story of Eleanor
Retrieved from "https://en.wikipedia.org/w/index.php?title=Eleanor_(automobile)&oldid=801964939"
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