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:
“I’d like to come back as an independent woman who has more ambition than I have.”
—Jenny Bird (b. c. 1937)
“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)
“With a broad shoehorn
I am unstuffing a big bird in this dream
Msomebody else’s holiday feast—
and repacking the crop of my own,
knowing it will burst with such
onion, oyster, savory bread crust.”
—Maxine Kumin (b. 1925)