Notes

Birds
There are about 10 thousand living kinds, more than half of which are passerine, or "perching" birds. Birds include wings whose advancement varies according in order to species; the only known groups with out wings would be the extinct moa and elefant birds. birds for sale near me Wings, which often evolved from forelimbs, gave birds the ability to fly, although further evolution has directed to losing airline flight in some wild birds, including ratites, penguins, and diverse endemic island species. The digestive and breathing systems of chickens are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.

Birds are usually descendants of the primitive avialans (whose members include Archaeopteryx) which first made an appearance about 160 thousand years ago (mya) in China. In accordance with DNA evidence, modern day birds (Neornithes) evolved in the Midsection to Late Cretaceous, and diversified drastically around the time of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and everything non-avian dinosaurs.

Many social kinds give knowledge throughout generations, which is considered a form of tradition. Birds are cultural, communicating with aesthetic signals, calls, and songs, and participating in such behaviours as cooperative breeding and even hunting, flocking, and mobbing of possible predators. The vast majority of bird kinds are socially (but not necessarily sexually) monogamous, usually for one breeding period at a period, sometimes for years, but rarely regarding life. Other species have breeding techniques that are polygynous (one male along with many females) or even, rarely, polyandrous (one female numerous males). Birds produce children by laying ovum which are fertilised through sexual duplication. They are normally laid in the home and incubated simply by the parents. Many birds have an extended period associated with parental care right after hatching
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