Notes

Birds
There are about ten thousand living species, more than 50 percent of which are usually passerine, or "perching" birds. Birds include wings whose advancement varies according to species; the sole known groups with out wings are the wiped out moa and elefant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although more evolution has led to the loss of airline flight in some chickens, including ratites, polar bears, and diverse endemic island species. The digestive and respiratory systems of chickens are also distinctly adapted for air travel. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have got further evolved for swimming.

Birds are descendants of the particular primitive avialans (whose members include Archaeopteryx) which first appeared about 160 mil years ago (mya) in China. According to DNA evidence, modern birds (Neornithes) evolved in the Center to Late Cretaceous, and diversified significantly around the time of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and non-avian dinosaurs.

Many social species pass on knowledge throughout generations, which is considered a form of traditions. Birds are cultural, communicating with visible signals, calls, and songs, and playing such behaviours because cooperative breeding plus hunting, flocking, in addition to mobbing of potential predators. The vast bulk of bird species are socially (but not necessarily sexually) monogamous, usually for one breeding season at a period, sometimes for years, but rarely regarding life. Other types have breeding systems that are polygynous (one male using many females) or, rarely, polyandrous (one female numerous males). Birds produce kids by laying ova which are fertilised through sexual reproduction. They are normally laid inside a home and incubated by simply the parents. birds for sale near me Most birds have a good extended period regarding parental care right after hatching
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