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:
“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)
“Then the little Hiawatha
Learned of every bird its language,
Learned their names and all their secrets,”
—Henry Wadsworth Longfellow (1809–1882)
“Before the last went, heavy with dew,
Back to the place from which she came
Where the bird was before it flew,
Where the flower was before it grew,
Where bird and flower were one and the same.”
—Robert Frost (1874–1963)