Bird
Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. With around 10,000 living species, they are the most speciose class of tetrapod vertebrates. All present species belong to the subclass Neornithes, and inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates that birds emerged within theropod dinosaurs during the Jurassic period, around 160 million years (Ma) ago. Paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Paleogene extinction event 65.5 Ma (million years) ago.
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Famous quotes containing the word bird:
“The soul has illusions as the bird has wings: it is supported by them.”
—Victor Hugo (1802–1885)
“Some say that ever ‘gainst that season comes
Wherein our Saviour’s birth is celebrated,
The bird of dawning singeth all night long:
And then, they say, no spirit dare stir abroad,
The nights are wholesome, then no planets strike,
No fairy tale nor witch hath power to charm,
So hallow’d and so gracious is the time.”
—William Shakespeare (1564–1616)
“My faith is the grand drama of my life. I’m a believer, so I sing words of God to those who have no faith. I give bird songs to those who dwell in cities and have never heard them, make rhythms for those who know only military marches or jazz, and paint colours for those who see none.”
—Olivier Messiaen (1908–1992)