List of mammals of Great Britain

This is a list of mammals of Great Britain. 
The Great Britain mammal fauna is impoverished compared with that of continental Europe. This is because there was only a short time between the last ice age and the flooding of the land bridge between Britain and the rest of Europe. The list only has land species which crossed before the creation of the English Channel, and those later brought in by humans.
Native (indigenous) species have three possible definitions:
This list includes mammals from the small islands around Great Britain and the Channel Islands. There are no endemic mammal species in Great Britain, although four distinct subspecies of rodents have arisen on small islands.
Rodentia.
Rodents make up the largest order of mammals, with over 40 percent of mammalian species. They have two incisors in the upper and lower jaw which grow continuously and must be kept short by gnawing. Most rodents are small though the coypu (once introduced to Great Britain, but subsequently eradicated) can weigh up to 9 kg (15.5 lb).
Family: Castoridae (beavers)
Family: Cricetidae (voles)
Family: Muridae (rats, mice and relatives)
Family: Gliridae (dormice)
Family: Sciuridae (squirrels)
Lagomorpha.
The lagomorphs comprise two families, Leporidae (hares and rabbits), and Ochotonidae (pikas). Though they can resemble rodents, and were classified as a superfamily in that order until the early 20th century, they have since been considered a separate order. They differ from rodents in a number of physical characteristics, such as having four incisors in the upper jaw rather than two.
Family: Leporidae (hares and rabbits)
Hedgehogs.
Superorder: Laurasiatheria
Order: Erinaceomorpha
The order Erinaceomorpha contains a single family, Erinaceidae, which comprise the hedgehogs and gymnures. The hedgehogs are easily recognised by their spines while gymnures look more like large rats.
Shrews and moles.
Superorder: Laurasiatheria
Order: Soricomorpha
The "shrew-forms" are insectivorous mammals. The shrews and soledons closely resemble mice while the moles are stout-bodied burrowers. 
Bats.
Superorder: Laurasiatheria
Order: Chiroptera
The bats' most distinguishing feature is that their forelimbs are developed as wings, making them the only mammals in the world naturally capable of flight. Bat species account for about 20% of all mammals.
Even-toed ungulates.
Superorder: Laurasiatheria
Order: Artiodactyla
The even-toed ungulates are ungulates whose weight is borne about equally by the third and fourth toes, rather than mostly or entirely by the third as in perissodactyls. There are about 220 artiodactyl species, including many that are of great economic importance to humans.
Odd-toed ungulates.
Superorder: Laurasiatheria
Order: Perissodactyla
The odd-toed ungulates are browsing and grazing mammals. They are usually large to very large, and have relatively simple stomachs and a large middle toe.
Carnivora.
Superorder: Laurasiatheria
Order: Carnivora
There are over 260 species of carnivorans, the majority of which feed primarily on meat. They have a characteristic skull shape and dentition. 
Order: Cetacea.
Whales.
The order Cetacea includes whales, dolphins and porpoises. They are the mammals most fully adapted to aquatic life with a spindle-shaped nearly hairless body, protected by a thick layer of blubber, and forelimbs and tail modified to provide propulsion underwater.
Introduced animals.
Diprotodontia.
Though most marsupials make up a great part of the fauna in the Australian region, the red-necked wallaby has been introduced and a feral population is currently breeding on the island of Inchconnachan, and at Loch Lomond in Argyll and Bute, Scotland. A smaller group is present on the Isle of Man, and the species is locally extinct in the Peak District, in Cumbria, and at Ashdown Forest in East Sussex.
Family: Macropodidae (kangaroos, wallabies, and kin)
Rodentia.
Rodents make up the largest order of mammals, with over 40 percent of mammalian species. They have two incisors in the upper and lower jaw which grow continuously and must be kept short by gnawing. Most rodents are small though the coypu (once introduced to Great Britain, but subsequently eradicated) can weigh up to 9 kg (15.5 lb).
Family: Muridae (rats, mice and relatives)
Family: Gliridae (dormice)
Family: Sciuridae (squirrels)
Lagomorpha.
The lagomorphs comprise two families, Leporidae (hares and rabbits), and Ochotonidae (pikas). Though they resemble rodents, and were classified as a superfamily in that order until the early 20th century, they have since been put in a separate order. They differ from rodents in a number of physical characteristics, such as having four incisors in the upper jaw rather than two.
Family: Leporidae (hares and rabbits)
Shrews and moles.
Superorder: Laurasiatheria
Order: Soricomorpha
The "shrew-forms" are insectivorous mammals. The shrews and soledons closely resemble mice while the moles are stout-bodied burrowers.
Even-toed ungulates.
Superorder: Laurasiatheria
Order: Artiodactyla
The even-toed ungulates are ungulates whose weight is borne about equally by the third and fourth toes, rather than mostly or entirely by the third as in perissodactyls. There are about 220 artiodactyl species, including many that are of great economic importance to humans.
Carnivora.
Superorder: Laurasiatheria
Order: Carnivora