Atropoides

Atropoides is a genus of venomous Pit vipers found in Mexico and Central America. There are currently three species found. Atropoides are also known as the ""Jumping Pit vipers" or the "Jumping Vipers"".
Description.
Jumping Vipers grow up to the length of around 90 centimeters (36 inches), while the longest ever found was 120.2 centimeters (47 in). All of them are thick-bodied, with the Mexican Jumping Pit viper being the thickest, and the Picado's Jumping Pit viper being the slimmest. It has a large head, with small eyes, and a rounded snout, it also has a short tail. They are gray-brown, reddish brown or black in color with brown blotches on them.
Where they live.
The Jumping Vipers are found on the mountains of east Mexico, the lowlands of Central America, and Panama.
Behavior.
Even though this snake is known as the "Jumping Viper" they do not really jump, but some say when they attack an enemy or prey they strike at such a force they actually leave the ground. They are slow moving and are not very aggressive snakes. They are active during both night and day, but those which are found on high altitudes are usually active at day time.
Feeding.
Adult Jumping Vipers eat mainly small mammals and lizards, while young Jumping Vipers eat orthopterans, and skinks.