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There are about ten thousand living kinds, more than half of which are passerine, or "perching" birds.https://therockandduckshow.net/member.php?action=profile&uid=131065Birds possess wings whose development varies according to species; the only known groups without wings would be the vanished moa and elephant birds. Wings, which often evolved from forelimbs, gave birds to be able to fly, although more evolution has directed to loosing air travel in some parrots, including ratites, polar bears, and diverse endemic island species.http://bbs.superic.com/home.php?mod=space&uid=347756 https://darcvigilante.site/member.php?action=profile&uid=212827Typically the digestive and breathing systems of parrots are also distinctly adapted for trip. Some bird varieties of aquatic surroundings, particularly seabirds plus some waterbirds, have further evolved regarding swimming.Birds are usually descendants of the primitive avialans (whose members include Archaeopteryx) which first came out about 160 thousand years ago (mya) in China. According to DNA evidence, modern birds (Neornithes) evolved in the Midsection to Late Cretaceous, and diversified considerably around the moments of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and everything non-avian dinosaurs.Many social types give knowledge around generations, which is considered a sort of culture. Birds are sociable, communicating with visible signals, calls, in addition to songs, and engaged in such behaviours since cooperative breeding plus hunting, flocking, and mobbing of potential predators. The vast vast majority of bird kinds are socially (but not necessarily sexually) monogamous, usually intended for one breeding period at a period, sometimes for years, but rarely intended for life. Other types have breeding systems that are polygynous (one male together with many females) or, rarely, polyandrous (one female numerous males). Birds produce children by laying ovum which are fertilised through sexual duplication. They are normally laid inside a call home and incubated by the parents. Many birds have a great extended period involving parental care following hatching