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There are about ten thousand living kinds, more than half of which are usually passerine, or "perching" birds. Birds have wings whose enhancement varies according to species; the sole known groups without wings are definitely the wiped out moa and elephant birds. https://aquaparrot.com/ Wings, which in turn evolved from forelimbs, gave birds the opportunity to fly, although more evolution has led to losing trip in some chickens, including ratites, polar bears, and diverse endemic island species. The digestive and respiratory systems of birds are also distinctly adapted for flight. Some bird types of aquatic environments, particularly seabirds plus some waterbirds, possess further evolved regarding swimming.Birds are usually descendants of typically the primitive avialans (whose members include Archaeopteryx) which first made an appearance about 160 thousand years ago (mya) in China. According to DNA evidence, contemporary birds (Neornithes) advanced in the Middle to Late Cretaceous, and diversified dramatically around the moments of the Cretaceous? Paleogene extinction event sixty six mya, which wiped out off the pterosaurs and everything non-avian dinosaurs.Many social species spread knowledge across generations, which is considered a form of tradition. Birds are interpersonal, communicating with visible signals, calls, plus songs, and taking part in such behaviours as cooperative breeding and hunting, flocking, in addition to mobbing of potential predators. The vast majority of bird types are socially (but not necessarily sexually) monogamous, usually for one breeding season at a period, sometimes for decades, but rarely intended for life. Other varieties have breeding systems that are polygynous (one male using many females) or, rarely, polyandrous (one female numerous males). Birds produce kids by laying eggs which are fertilised through sexual duplication. They are generally laid inside a nest and incubated by the parents. Many birds have an extended period of parental care after hatching