Notes

Birds
There are about 10 thousand living varieties, more than fifty percent of which are usually passerine, or "perching" birds. Birds possess wings whose growth varies according in order to species; the just known groups with out wings are the extinct moa and elefant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although additional evolution has directed to loosing airline flight in some chickens, including ratites, polar bears, and diverse endemic island species. The digestive and respiratory systems of wild birds are also distinctly adapted for flight. Some bird types of aquatic conditions, particularly seabirds in addition to some waterbirds, include further evolved for swimming.

Birds are descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 thousand years ago (mya) in China. According to DNA evidence, contemporary birds (Neornithes) evolved in the Center to Late Cretaceous, and diversified drastically around the moments of the Cretaceous? birds for sale near me Paleogene extinction event sixty six mya, which murdered off the pterosaurs and non-avian dinosaurs.

Many social kinds pass on knowledge throughout generations, which is usually considered a kind of culture. Birds are interpersonal, communicating with visual signals, calls, and even songs, and taking part in such behaviours because cooperative breeding in addition to hunting, flocking, and even mobbing of potential predators. The vast vast majority of bird varieties are socially (but not necessarily sexually) monogamous, usually intended for one breeding time at a period, sometimes for decades, but rarely for life. Other varieties have breeding systems that are polygynous (one male using many females) or even, rarely, polyandrous (one female numerous males). Birds produce children by laying ovum which are fertilised through sexual processing. They are normally laid in a nest and incubated by the parents. Many birds have a great extended period of parental care after hatching
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