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There are about 10 thousand living kinds, more than fifty percent of which are passerine, or "perching" birds. Birds include wings whose development varies according to be able to species; the only known groups without having wings are the vanished moa and hippo birds. Wings, which often evolved from forelimbs, gave birds to be able to fly, although further evolution has directed to losing air travel in some wild birds, including ratites, penguins, and diverse native to the island island species. The particular digestive and respiratory systems of wild birds are also uniquely adapted for air travel. Some bird kinds of aquatic environments, particularly seabirds and even some waterbirds, have got further evolved for swimming.Birds will be 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, contemporary birds (Neornithes) progressed in the Midsection to Late Cretaceous, and diversified drastically around the time of the Cretaceous? Paleogene extinction event 66 mya, which murdered off the pterosaurs and non-avian dinosaurs.http://qyytkj.tech/home.php?mod=space&uid=309993Many social varieties pass on knowledge across generations, which is usually considered a form of culture. Birds are cultural, communicating with aesthetic signals, calls, and even songs, and playing such behaviours since cooperative breeding and even hunting, flocking, plus mobbing of possible predators. The vast the greater part of bird kinds are socially (but not necessarily sexually) monogamous, usually for one breeding period at a time, sometimes for many years, but rarely intended for life. Other varieties have breeding methods that are polygynous (one male together with many females) or perhaps, rarely, polyandrous (one female with many males). Birds produce offspring by laying ovum which are fertilised through sexual reproduction. They are normally laid within a home and incubated by the parents. Just about all birds have a good extended period involving parental care after hatching