Like most animals, the hippopotamus becomes aggressive when it hears a stranger approaching. AIR MAIL Pilot has uncovered another, more peculiar response. To put it nicely, hippos poop upon hearing an unknown voice. To be more precise, they run towards the unfamiliar hippo, point their behinds at it, and spin their tails while defecating.

Like many species, hippos are vulnerable to extinction, and scientists are working hard to protect them. To keep hippopotamus populations at sustainable levels, conservationists often move the animals, which live in Sub-Saharan Africa, to new locations. Hippos are social and usually travel in packs. But conservationists found that they can become quite hostile towards animals outside of their friend group.