Difference between revisions of "Birds"
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| − | [https://www.pinterest.com/pin/649644315004712474/ https://www.pinterest.com/pin/649644315004712474/] <br /><br />There are about | + | [https://www.pinterest.com/pin/649644315004712474/ https://www.pinterest.com/pin/649644315004712474/] <br /><br />There are about five thousand living kinds, more than half of which are passerine, or "perching" birds. Birds possess wings whose development varies according to species; the sole known groups without having wings are the extinct moa and elefant birds. Wings, which often evolved from forelimbs, gave birds the opportunity to fly, although more evolution has directed to losing flight in some parrots, including ratites, penguins, and diverse native to the island island species. The particular digestive and respiratory systems of wild birds are also distinctly adapted for flight. Some bird species of aquatic conditions, particularly seabirds and some waterbirds, possess further evolved with regard to swimming.<br /><br />Birds are descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 , 000, 000 years ago (mya) in China. According to DNA evidence, modern day birds (Neornithes) advanced in the Midst to Late Cretaceous, and diversified significantly around the moments of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and all non-avian dinosaurs.<br /><br />Many social types pass on knowledge around generations, which is considered a type of tradition. Birds are social, communicating with aesthetic signals, calls, in addition to songs, and participating in such behaviours since cooperative breeding and even hunting, flocking, in addition to mobbing of possible predators. The vast the greater part of bird species are socially (but not necessarily sexually) monogamous, usually with regard to one breeding time at a time, sometimes for many years, but rarely with regard to life. Other kinds have breeding devices that are polygynous (one male with many females) or even, rarely, polyandrous (one female with many males). Birds produce children by laying ova which are fertilised through sexual duplication. They are normally laid in the nest and incubated by the parents. Most birds have an extended period involving parental care after hatching |
Revision as of 16:35, 7 October 2021
https://www.pinterest.com/pin/649644315004712474/
There are about five thousand living kinds, more than half of which are passerine, or "perching" birds. Birds possess wings whose development varies according to species; the sole known groups without having wings are the extinct moa and elefant birds. Wings, which often evolved from forelimbs, gave birds the opportunity to fly, although more evolution has directed to losing flight in some parrots, including ratites, penguins, and diverse native to the island island species. The particular digestive and respiratory systems of wild birds are also distinctly adapted for flight. Some bird species of aquatic conditions, particularly seabirds and some waterbirds, possess further evolved with regard to swimming.
Birds are descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 , 000, 000 years ago (mya) in China. According to DNA evidence, modern day birds (Neornithes) advanced in the Midst to Late Cretaceous, and diversified significantly around the moments of the Cretaceous? Paleogene extinction event 66 mya, which killed off the pterosaurs and all non-avian dinosaurs.
Many social types pass on knowledge around generations, which is considered a type of tradition. Birds are social, communicating with aesthetic signals, calls, in addition to songs, and participating in such behaviours since cooperative breeding and even hunting, flocking, in addition to mobbing of possible predators. The vast the greater part of bird species are socially (but not necessarily sexually) monogamous, usually with regard to one breeding time at a time, sometimes for many years, but rarely with regard to life. Other kinds have breeding devices that are polygynous (one male with many females) or even, rarely, polyandrous (one female with many males). Birds produce children by laying ova which are fertilised through sexual duplication. They are normally laid in the nest and incubated by the parents. Most birds have an extended period involving parental care after hatching
