This is the heaviest viper, and also has the longest fangs and most venom. It is native to Equatorial Africa, but this one is at the Serpentarium in Mendoza, Argentina.
Gaboon Viper, at AMNH, NY. One of the most exquisitely patterned snakes. (Its pattern includes at least 200 triangles!)It may have eaten, but they are naturally very stout-bodied. They rely on concealment and powerful venom to get their prey.