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:
“And the one bird singing alone to his nest,
And the one star over the tower.
I thought of our little quarrels and strife,
And the letter that brought me back my ring;
And it all seem’d then, in the waste of life,”
—“Owen” “Meredith” (1831–1891)
“Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.”
—Bible: Hebrew Ecclesiastes 10:20.
“The skreak and skritter of evening gone
And grackles gone and sorrows of the sun,
The sorrows of sun, too, gone . . . the moon and moon,
The yellow moon of words about the nightingale
In measureless measures, not a bird for me....”
—Wallace Stevens (1879–1955)