Notes

Birds
There are about ten thousand living kinds, more than fifty percent of which are usually passerine, or "perching" birds. Birds have wings whose enhancement varies according in order to species; the sole known groups with out wings are definitely the extinct moa and elephant birds. Wings, which usually evolved from forelimbs, gave birds the opportunity to fly, although even more evolution has led to loosing flight in some chickens, including ratites, penguins, and diverse native to the island island species. The digestive and breathing systems of birds are also distinctly adapted for air travel. Some bird kinds of aquatic environments, particularly seabirds and even some waterbirds, have further evolved with regard to 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. According to DNA evidence, modern day birds (Neornithes) developed in the Middle to Late Cretaceous, and diversified considerably around the moments of the Cretaceous? birds for sale near me Paleogene extinction event 66 mya, which wiped out off the pterosaurs and non-avian dinosaurs.

Many social species pass on knowledge throughout generations, which is considered a type of lifestyle. Birds are cultural, communicating with image signals, calls, and songs, and engaged in such behaviours as cooperative breeding and even hunting, flocking, plus mobbing of potential predators. The vast vast majority of bird types are socially (but not necessarily sexually) monogamous, usually intended for one breeding time at a time, sometimes for many years, but rarely regarding life. Other types have breeding techniques that are polygynous (one male using many females) or, rarely, polyandrous (one female numerous males). Birds produce children by laying eggs which are fertilised through sexual duplication. They are generally laid in a nest and incubated simply by the parents. Many birds have an extended period of parental care after hatching
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