Slow Loris

This nocturnal primate has big eyes and long limbs that make it an adorable inspiration for a stuffed animal. But watch out when it drops an elbow: These animals have toxin-producing glands in their upper arms, which they then lick, filling their mouth with poison, before biting their prey.

Only small animals have actually died from the bites, but at least one researcher has been sent to the hospital after a loris attack.