Notes

Birds
There are about eight thousand living types, more than half of which are passerine, or "perching" birds. Birds include wings whose growth varies according to be able to species; the only known groups without having wings are the vanished moa and hippo birds. Wings, which evolved from forelimbs, gave birds to be able to fly, although further evolution has guided to loosing flight in some birds, including ratites, polar bears, and diverse native to the island island species. The digestive and breathing systems of wild birds are also distinctly adapted for trip. Some bird types of aquatic environments, particularly seabirds and even some waterbirds, have got further evolved for swimming.

Birds are usually descendants of the particular primitive avialans (whose members include Archaeopteryx) which first appeared about 160 , 000, 000 years ago (mya) in China. In accordance with DNA evidence, modern birds (Neornithes) progressed in the Middle to Late Cretaceous, and diversified significantly around the moments of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and everything non-avian dinosaurs.

Many social types spread knowledge around generations, which is considered a kind of culture. Birds are social, communicating with visible signals, calls, and songs, and taking part in such behaviours while cooperative breeding plus hunting, flocking, and mobbing of predators. The vast the greater part of bird types are socially (but not necessarily sexually) monogamous, usually for one breeding season at a moment, sometimes for years, but rarely with regard to life. Other species have breeding methods that are polygynous (one male using many females) or perhaps, rarely, polyandrous (one female with many males). birds for sale near me Birds produce children by laying ovum which are fertilised through sexual duplication. They are normally laid within a nest and incubated by the parents. Most birds have a great extended period involving parental care right after hatching
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