Birds do it, all right. And they're perfectly happy to fly solo. New research suggests that we should welcome birds to the sweaty club of animals that masturbate, which is way less exclusive than we thought. "Avian self-pleasure is usually a rather inelegant affair, in which a bird rubs their cloaca (a shared orifice for both excretion and reproduction) against an object, like a branch, twig or toy," the team behind the study writes in The Conversation. "This is often accompanied by a lot of