Sheep

Sheep are animals that are supposed to be herbivores, but can also be meat eating psychos, as seen in the picture. New Zealanders are often the butt of sheep jokes, at least until they all turn crazy and eat everyone's guts.

They also smell very bad, forcing everyone around them to cover their noses. They have thick coats of wool, which is used for various things, although the general population is unaware that it will also turn them into sheep.

They can masquerade as humans, even down to the DNA, disguising their true sheepy form until they murder you in your bed.