Habitat decline has led to human confrontations in which their incredibly strong teeth are being used as weapons. In one case, a man bled to death after a beaver bite severed an artery in his leg.
The Cone Snail
These snails have a hypodermic-like tooth that extends from their mouth and paralyzes their prey, bottom dwelling fish. Some of the larger species stings have been documented as being fatal to humans.
The Slow Loris
These adorable primates may look cute but they have a secret weapon: a toxinsecreting gland that, when mixed with their saliva, produces a compound that can cause symptoms similar to an allergic reaction.
One of the most poisonous vertebrates on the planet. Many of their organs and their skin contain a deadly toxin called tetrodotoxin which can be fatal if humans eat them incorrectly cooked.
Cows may look docile but on average, one person is trampled to death by cows each year in the UK. They stampede when the herd feels threatened, particularly when a calf and its mother are separated.