From ants to zorillas, get ready to discover some seriously strange animal behaviors. Slurp up soupy insides with houseflies, spit sticky saliva to build nests with birds, and fend off predators with poop-flinging caterpillars and farting snakes. And that's just the tip of the dung pile! These yucky habits may seem surprising to us, but they're totally normal for these animals. In fact, their survival depends on them.