Turkey Vultures
These scavengers are not known for their natural beauty, and what they do to defend themselves can be considered even more disgusting. The turkey vultures gorge themselves on carrion, which is the dead, rotting bodies that are detected through the highly developed sense of smell.
The birds will, at times, overindulge on their food and then regurgitate it to take it off from other predators. They will also employ an effective tactic against predators, puking right onto their enemies as a way to deter them from further pursuit. While the vulture is free to fly another day, the enemy is left covered in rotting meat vomit.