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There are about five thousand living types, more than half of which are passerine, or "perching" birds. Birds include wings whose advancement varies according to species; the only known groups without having wings will be the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds a chance to fly, although more evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse native to the island island species. The digestive and respiratory system systems of birds are also distinctly adapted for airline flight. Some bird kinds of aquatic environments, particularly seabirds plus some waterbirds, have got further evolved intended for swimming.Birds happen to be descendants of typically the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 , 000, 000 years ago (mya) in China. According to DNA evidence, modern birds (Neornithes) progressed in the Midst to Late Cretaceous, and diversified significantly around the time of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and everything non-avian dinosaurs.Many social types give knowledge across generations, which is considered a type of traditions. Birds are social, communicating with image signals, calls, and even songs, and participating in such behaviours since cooperative breeding in addition to hunting, flocking, in addition to mobbing of predators. The vast bulk of bird kinds are socially (but not necessarily sexually) monogamous, usually for one breeding season at a period, sometimes for years, but rarely intended for life. Other species have breeding techniques that are polygynous (one male using many females) or even, rarely, polyandrous (one female with many males). https://anotepad.com/notes/3di3ejbn Birds produce offspring by laying ova which are fertilised through sexual imitation. http://guiderub3.bravesites.com/entries/general/birds They are normally laid within a nest and incubated simply by the parents. Just about all birds have an extended period regarding parental care following hatching