See It to Believe It: Animals Vomit, Spurt Blood to Thwart Predators

The animal kingdom is full of weird stuff, like animals that turn into zombies—and one thing many of them will do is go to great (and gross) lengths to avoid predators. Armored crickets, which are native to Namibia, South Africa, and Botswana, have a particularly disgusting means of driving away predators: They spew vomit and spurt hemolymph (the mollusk and arthropod version of blood) from under their legs and through slits in their exoskeleton. Katydids do it too; in fact, in Germany the species has acquired the nickname "blutspritzer," or "blood squirter." But that's not all. Wounded crickets can attract other crickets foraging for protein and salt—and the healthy crickets are happy to become cannibals. According to BBC: