The saw-scaled viper, Echis carinatus ... bodies are not only keeled but also serrated — just like the teeth of a saw. The snakes compress their bodies into an “S” shape when threatened.

The Gaboon viper is native to rainforests of central, eastern, and western Africa. It is not an aggressive snake, but its two-inch fangs are the longest of any venomous snake, and it produces more ...