Birds

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There are about eight thousand living varieties, more than half of which will be passerine, or "perching" birds. Birds possess wings whose enhancement varies according in order to species; the only known groups without wings will be the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the opportunity to fly, although further evolution has led to the losing of trip in some parrots, including ratites, polar bears, and diverse endemic island species. The particular digestive and the respiratory system systems of chickens are also uniquely adapted for trip. Some bird varieties of aquatic environments, particularly seabirds and some waterbirds, include further evolved with regard to swimming.

Birds happen to be descendants of the particular primitive avialans (whose members include Archaeopteryx) which first came out about 160 million years ago (mya) in China. According to DNA evidence, modern day birds (Neornithes) developed in the Middle to Late Cretaceous, and diversified significantly around the time of the Cretaceous? Paleogene extinction event 66 mya, which wiped out off the pterosaurs and non-avian dinosaurs.

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