The Turkey Vulture’s primary defense is to vomit on its predators!

Typically found throughout the Americas, the Turkey Vulture is the most widespread of all New World vultures. Although it is generally at the top of the food chain, it does have some threats such as golden eagles, bald eagles, and great horned owls. 

However, the threat to the vulture is often not directly to the bird itself but rather to its eggs. The Turkey Vulture, when threatened, has one primary defense mechanism. It will regurgitate semi-digested meat, which smells absolutely rancid and will deter most any animal.

If the smell doesn’t drive predators away, the vomit will actually sting if it comes in contact with another animals face or eyes. While this is incredibly useful when dealing with threats, the Turkey Vulture will actually quickly vomit if it needs a quick take off and hasn’t digested its food! If only human vomit was as useful! 

(Source)