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There are about ten thousand living types, more than 1 / 2 of which are passerine, or "perching" birds. Birds include wings whose enhancement varies according to be able to species; the only known groups with out wings would be the extinct moa and hippo birds. Wings, which usually evolved from forelimbs, gave birds the ability to fly, although additional evolution has led to losing airline flight in some parrots, including ratites, polar bears, and diverse native to the island island species. The digestive and breathing systems of birds are also uniquely adapted for airline flight. Some bird varieties of aquatic surroundings, particularly seabirds and even some waterbirds, possess further evolved with regard to swimming.Birds are usually descendants of the particular primitive avialans (whose members include Archaeopteryx) which first appeared about 160 million years ago (mya) in China. According to DNA evidence, contemporary birds (Neornithes) progressed in the Middle to Late Cretaceous, and diversified dramatically around the time of the Cretaceous? Paleogene extinction event sixty six mya, which murdered off the pterosaurs and non-avian dinosaurs.Many social kinds spread knowledge around generations, which is definitely considered a type of traditions. Birds are sociable, communicating with image signals, calls, and songs, and participating in such behaviours because cooperative breeding plus hunting, flocking, plus mobbing of possible predators. The vast bulk of bird types are socially (but not necessarily sexually) monogamous, usually with regard to one breeding period at a moment, sometimes for many years, but rarely regarding life. Other species have breeding techniques that are polygynous (one male with many females) or even, rarely, polyandrous (one female numerous males). Birds produce offspring by laying eggs which are fertilised through sexual imitation. https://controlc.com/d2a041ee They are generally laid in a home and incubated by the parents. https://workliquid05.doodlekit.com/blog/entry/18969663/birds Just about all birds have an extended period of parental care following hatching