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There are about eight thousand living varieties, more than 1 / 2 of which will be passerine, or "perching" birds. Birds have wings whose enhancement varies according to be able to species; the only known groups without wings would be the wiped out moa and elephant birds. Wings, which often evolved from forelimbs, gave birds to be able to fly, although additional evolution has guided to the losing of flight in some birds, including ratites, penguins, and diverse native to the island island species. The digestive and the respiratory system systems of birds are also uniquely adapted for flight. https://brownpath6.doodlekit.com/blog/entry/18967253/birds Some bird varieties of aquatic conditions, particularly seabirds in addition to some waterbirds, include further evolved with regard to swimming.Birds are usually descendants of the primitive avialans (whose members include Archaeopteryx) which first made an appearance about 160 , 000, 000 years ago (mya) in China. According to DNA evidence, contemporary birds (Neornithes) evolved in the Middle to Late Cretaceous, and diversified drastically around the time of the Cretaceous? Paleogene extinction event sixty six mya, which killed off the pterosaurs and non-avian dinosaurs.Many social types spread knowledge across generations, which is definitely considered a kind of culture. Birds are interpersonal, communicating with visible signals, calls, in addition to songs, and taking part in such behaviours as cooperative breeding in addition to hunting, flocking, in addition to mobbing of possible predators. The vast majority of bird varieties are socially (but not necessarily sexually) monogamous, usually regarding one breeding period at a time, sometimes for many years, but rarely regarding life. https://bronzethumb8.gumroad.com/p/birds-148182c4-b9f6-45a2-bec5-e8689a1595e6 Other kinds have breeding methods that are polygynous (one male together with many females) or perhaps, rarely, polyandrous (one female numerous males). Birds produce children by laying ova which are fertilised through sexual processing. They are usually laid inside a call home and incubated by the parents. Just about all birds have a great extended period regarding parental care right after hatching