Roost
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 150 million years ago. Paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Paleogene extinction event 66 million years ago.
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Famous quotes containing the word roost:
““Our snowstorms as a rule
Aren’t looked on as man-killers, and although
I’d rather be the beast that sleeps the sleep
Under it all, his door sealed up and lost,
Than the man fighting it to keep above it,
Yet think of the small birds at roost and not
In nests....””
—Robert Frost (1874–1963)