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There are about 10 thousand living species, more than 50 percent of which will be passerine, or "perching" birds. Birds possess wings whose growth varies according in order to species; the only known groups without wings will be the vanished moa and elefant birds. Wings, which evolved from forelimbs, gave birds the opportunity to fly, although further evolution has led to the loss of air travel in some parrots, including ratites, penguins, and diverse endemic island species. The particular digestive and breathing systems of parrots are also uniquely adapted for air travel. Some bird varieties of aquatic conditions, particularly seabirds in addition to some waterbirds, have further evolved with regard to swimming.Birds are descendants of typically the primitive avialans (whose members include Archaeopteryx) which first came out about 160 , 000, 000 years ago (mya) in China. In accordance with DNA evidence, modern birds (Neornithes) developed in the Midst to Late Cretaceous, and diversified drastically around the time of the Cretaceous? Paleogene extinction event sixty six mya, which murdered off the pterosaurs and all non-avian dinosaurs.Many social species pass on knowledge across generations, which is usually considered a kind of tradition. Birds are sociable, communicating with visual signals, calls, and even songs, and playing such behaviours as cooperative breeding plus hunting, flocking, in addition to mobbing of potential predators. The vast the greater part of bird species are socially (but not necessarily sexually) monogamous, usually for one breeding period at a time, sometimes for decades, but rarely with regard to life. Other types have breeding techniques that are polygynous (one male with many females) or even, rarely, polyandrous (one female numerous males). Birds produce children by laying eggs which are fertilised through sexual duplication. They are typically laid in a home and incubated simply by the parents. Just about all birds have a great extended period associated with parental care after hatching https://aquaparrot.com/