Birds
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There are about 10 thousand living types, more than 50 percent of which will be passerine, or "perching" birds. Birds include wings whose growth varies according to be able to species; the only known groups without wings are definitely the wiped out moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although even more evolution has led to loosing trip in some wild birds, including ratites, polar bears, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird varieties of aquatic conditions, particularly seabirds in addition to some waterbirds, have further evolved with regard to swimming.
Birds will be descendants of the particular primitive avialans (whose members include Archaeopteryx) which first came out about 160 million years ago (mya) in China. Based on DNA evidence, modern day birds (Neornithes) advanced in the Center to Late Cretaceous, and diversified considerably around the time of the Cretaceous? Paleogene extinction event 66 mya, which murdered off the pterosaurs and non-avian dinosaurs.
Many social species spread knowledge throughout generations, which will be considered a type of culture. Birds are cultural, communicating with visible signals, calls, in addition to songs, and participating in such behaviours because cooperative breeding and hunting, flocking, and mobbing of predators. The vast bulk of bird kinds are socially (but not necessarily sexually) monogamous, usually regarding one breeding period at a moment, sometimes for decades, but rarely regarding life. Other varieties have breeding methods that are polygynous (one male together with many females) or, rarely, polyandrous (one female with many males). Birds produce kids by laying ovum which are fertilised through sexual imitation. They are usually laid in a nest and incubated by simply the parents. Most birds have a great extended period of parental care following hatching
