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There are about five thousand living kinds, more than half of which happen to be passerine, or "perching" birds. Birds have wings whose growth varies according in order to species; the sole known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the opportunity to fly, although more evolution has led to the loss of flight in some chickens, including ratites, penguins, and diverse endemic island species. The particular digestive and respiratory system systems of parrots are also exclusively adapted for air travel. Some bird varieties of aquatic environments, particularly seabirds and even some waterbirds, include further evolved with regard to swimming.Birds are descendants of the particular primitive avialans (whose members include Archaeopteryx) which first appeared about 160 mil years ago (mya) in China. According to DNA evidence, modern day birds (Neornithes) developed in the Midst to Late Cretaceous, and diversified dramatically around the moments of the Cretaceous? Paleogene extinction event 66 mya, which murdered off the pterosaurs and everything non-avian dinosaurs.Many social varieties spread knowledge across generations, which is considered a form of tradition. Birds are sociable, communicating with visual signals, calls, in addition to songs, and engaged in such behaviours while cooperative breeding plus hunting, flocking, and mobbing of potential predators. The vast vast majority of bird varieties are socially (but not necessarily sexually) monogamous, usually for one breeding time at a period, sometimes for many years, but rarely regarding life. Other species have breeding systems that are polygynous (one male with many females) or even, rarely, polyandrous (one female with many males). http://ttytcammy.vn/Default.aspx?tabid=120&ch=43605 Birds produce kids by laying ova which are fertilised through sexual duplication. They are typically laid inside a nest and incubated by simply the parents. Many birds have the extended period of parental care after hatching https://wesale.pk/members/pastadock3/activity/252343/