A Gaboon viper idles on the forest floor in Central Africa. For some ultrablack animals, their dark color can help them blend in with dark underbrush. Interestingly, part of the Gaboon viper’s ...

Gaboon vipers live in select parts of Africa, while king cobras live in Southeast Asia and India. King cobras can’t sense heat like pit vipers, but they have better eyesight than most snakes.