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There are about five thousand living species, more than 50 percent of which are passerine, or "perching" birds. Birds have got wings whose development varies according in order to species; the sole known groups with out wings would be the vanished moa and dickhäuter (umgangssprachlich) birds. Wings, which in turn evolved from forelimbs, gave birds the opportunity to fly, although more evolution has guided to the loss of flight in some chickens, including ratites, polar bears, and diverse endemic island species. Typically the digestive and breathing systems of birds are also distinctively adapted for air travel. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have got further evolved with regard to swimming.Birds will be descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 million years ago (mya) in China. According to DNA evidence, contemporary birds (Neornithes) advanced in the Midst to Late Cretaceous, and diversified significantly around the moments of the Cretaceous?https://aquaparrot.com/Paleogene extinction event sixty six mya, which killed off the pterosaurs and all non-avian dinosaurs.Many social species give knowledge throughout generations, which is considered a type of traditions. Birds are interpersonal, communicating with aesthetic signals, calls, in addition to songs, and engaged in such behaviours while cooperative breeding and hunting, flocking, and mobbing of potential predators. The vast majority of bird species are socially (but not necessarily sexually) monogamous, usually with regard to one breeding period at a period, sometimes for many years, but rarely with regard to life. Other varieties have breeding techniques that are polygynous (one male with many females) or perhaps, rarely, polyandrous (one female with many males). Birds produce offspring by laying ova which are fertilised through sexual reproduction. They are typically laid in a nest and incubated by simply the parents. Many birds have a great extended period regarding parental care after hatching