The best of real science and real fun. From blowing bubbles to spraying acid, the world's insects do amazing things with this under-appreciated part of their anatomy. Discover the wild and weird ways insects use their butts to avoid predators. Spittlebugs blow bubbles from their butts and hide under them, while some caterpillars shoot their poop far from their bodies to throw poop-searching wasps off their trail. Ants and beetles spray acid from their butts into the faces of predators, while some caterpillars and larvae build hide-outs with their poop to keep predators away.