Alongside a mountain road in northern Venezuela, a venomous creature tucked up its 1-foot-long body and hid under a rock to wait for nightfall. The lurking animal caught the attention of passing ...

If caught on land, these animals have no chance to evade predators, such as big cats, and must try to defend themselves by clawing and biting. Though they couldn't be clumsier on land, sloths are ...