Jumping Pit Viper
Atropoides mexicanus

f20 @ 1/40s, ISO:1250, Nikon D3S w 105mm macro

"Atropoides mexicanus," Wikipedia, the free encyclopedia. Atropoides mexicanus is a venomous pitviper species endemic to Mexico and Central America. These snakes are extremely thick-bodied. The head is large, with small eyes and a broadly rounded snout. The tail is short, not prehensile, and accounts for only 15% of the total length. The color pattern usually consists of a gray-brown or reddish brown ground color (sometimes yellow, cream, purplish brown or black), overlaid with a series of lateral and dorsal blotches. The shape of these blotches is subject to some variation, but is sometimes still helpful for identification. The common name alludes to the supposed ability these snakes have to launch themselves at an attacker during a strike, thereby bridging a distance that is equal to or greater than the length of the body.
El Valle de Anton, Panama