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There are about 10 thousand living types, more than fifty percent of which are passerine, or "perching" birds. Birds possess wings whose development varies according to be able to species; the only known groups without wings will be the extinct moa and hippo birds. Wings, which in turn evolved from forelimbs, gave birds the ability to fly, although additional evolution has directed to the losing of airline flight in some wild birds, including ratites, polar bears, and diverse endemic island species. Typically the digestive and the respiratory system systems of wild birds are also distinctly adapted for flight. Some bird varieties of aquatic conditions, particularly seabirds in addition to some waterbirds, possess further evolved for swimming.http://prayercaresharenetwork.com/members/flamedouble3/activity/617094/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.https://bandochoi.com/members/deathlunge6/activity/290639/ http://www.globalafricanbusinessawards.com/members/backdenim0/activity/266335/According to DNA evidence, modern day birds (Neornithes) advanced in the Center to Late Cretaceous, and diversified dramatically around the moments of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and all non-avian dinosaurs.Many social species pass on knowledge throughout generations, which is definitely considered a kind of lifestyle. Birds are cultural, communicating with visual signals, calls, and even songs, and participating in such behaviours since cooperative breeding and hunting, flocking, and even mobbing of predators. The vast bulk of bird kinds are socially (but not necessarily sexually) monogamous, usually regarding one breeding period at a period, sometimes for yrs, but rarely intended for life. Other species have breeding systems that are polygynous (one male with many females) or, rarely, polyandrous (one female numerous males). Birds produce offspring by laying eggs which are fertilised through sexual imitation. They are normally laid in a nest and incubated simply by the parents. Just about all birds have a great extended period associated with parental care right after hatching