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A '''Bird''' is a warm-blooded [[egg]]-laying [[vertebrate]] with [[wing]]s and [[feather]]s.  For the most part, they fly.

A '''Bird''' is a warm-blooded [[egg]]-laying [[vertebrate]] with [[wing]]s and [[feather]]s.  For the most part, they fly.

[[Ostrich]]es, [[penguin]]s, and [[emu]]s are birds that don't fly, although penguins have sometimes been said to "fly" underwater. [[Robin]]s, [[sparrow]]s, [[cardinal (bird)|cardinal]]s, and [[eagle]]s are more typical flying birds.

[[Ostrich]]es, [[penguin]]s, and [[emu]]s are birds that don't fly, although penguins have sometimes been said to "fly" underwater. [[Robin]]s, [[sparrow]]s, [[cardinal (bird)|cardinal]]s, and [[eagle]]s are more typical flying birds.

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== Creationary view ==

== Creationary view ==

[[Creationism|Creationists]] contend that birds being descendants of [[dinosaur]]s is unreasonable and is not scientifically supported with any evidence.<ref>Sarfati, Jonathan, [http://www.creationontheweb.com/content/view/3833/106/ Bird Evolution], chapter 4 of Refuting Evolution.</ref><ref>McIntosh, Andy, [http://www.creationontheweb.com/content/view/540/ 100 years of airplanes—but these weren’t the first flying machines!], ''Creation'' 26(1):44–48, December 2003.</ref>

[[Creationism|Creationists]] contend that birds being descendants of [[dinosaur]]s is unreasonable and is not scientifically supported with any evidence.<ref>Sarfati, Jonathan, [http://www.creationontheweb.com/content/view/3833/106/ Bird Evolution], chapter 4 of Refuting Evolution.</ref><ref>McIntosh, Andy, [http://www.creationontheweb.com/content/view/540/ 100 years of airplanes—but these weren’t the first flying machines!], ''Creation'' 26(1):44–48, December 2003.</ref>

Since those words were written in 1993, however, many fossils of primitive birds and other theropods have been discovered, so it is no longer correct to consider the Late Mesozoic fossil evidence of this group as depauperate.

Since those words were written in 1993, however, many fossils of primitive birds and other theropods have been discovered, so it is no longer correct to consider the Late Mesozoic fossil evidence of this group as depauperate.

Almost all evolutionary biologists, with rare exceptions, believe that birds are the only extant group of dinosaurs, a branch of the theropods, which included ''Velociraptor'' and ''Deinonychus''. This view is disputed by [[creationism|creationists]], and also by a few prominent evolutionary biologists, including Storrs L. Olson, Curator of Birds at the [[National Museum of Natural History]] at the [[Smithsonian Institution]], who said: {{QuoteBox|The idea of feathered dinosaurs and the theropod origin of birds is being actively promulgated by a cadre of zealous scientists acting in concert with certain editors at Nature and National Geographic who themselves have become outspoken and highly biased proselytizers of the faith. Truth and careful scientific weighing of evidence have been among the first casualties in their program, which is now fast becoming one of the grander scientific hoaxes of our age—the paleontological equivalent of cold fusion.<ref>Olson, Storrs L., [http://creationontheweb.com/content/view/3385/ Open letter], 1st November, 1999.</ref>}}

including Storrs L. Olson, Curator of Birds at the [[National Museum of Natural History]] at the [[Smithsonian Institution]], who said: {{QuoteBox|The idea of feathered dinosaurs and the theropod origin of birds is being actively promulgated by a cadre of zealous scientists acting in concert with certain editors at Nature and National Geographic who themselves have become outspoken and highly biased proselytizers of the faith. Truth and careful scientific weighing of evidence have been among the first casualties in their program, which is now fast becoming one of the grander scientific hoaxes of our age—the paleontological equivalent of cold fusion.<ref>Olson, Storrs L., [http://creationontheweb.com/content/view/3385/ Open letter], 1st November, 1999.</ref>}}

Since Olsen's open letter was published in 1999, however, numerous theropod fossils with clear evidence of feathers have been discovered<ref>Göhlich, U.B., and Chiappe, L.M. (2006). "A new carnivorous dinosaur from the Late Jurassic Solnhofen archipelago." Nature, 440: 329-332</ref>. This and other evidence means there is now little doubt about the close relationship of birds, as extant dinosaurs, to the extinct theropod dinosaurs. Birds appear to have split from other dinosaur lineages sometime before the mid-Jurassic, 155-150 million years ago.

Since Olsen's open letter was published in 1999, however, numerous theropod fossils with clear evidence of feathers have been discovered<ref>Göhlich, U.B., and Chiappe, L.M. (2006). "A new carnivorous dinosaur from the Late Jurassic Solnhofen archipelago." Nature, 440: 329-332</ref>. This and other evidence means there is now little doubt about the close relationship of birds, as extant dinosaurs, to the extinct theropod dinosaurs. Birds appear to have split from other dinosaur lineages sometime before the mid-Jurassic, 155-150 million years ago.