单词	needletail
释义	needletail /ˈniːd(ə)lteɪl / (also needle-tailed swift) noun An Asian spine-tailed swift, believed to be the world’s fastest flying bird. Genus Hirundapus, family Apodidae: four species. Larger species, such as white-throated needletail, are amongst the fastest flyers in the animal kingdom.... The fastest normal wing-flapping flight ever clocked was of the white-throated needle-tailed swift in India: a reported 219 miles per hour. The needletails can seem drawn to the hills as if by a magnet; on good days, flocks arrive from the north, glide and circle around, then, with a few flaps of their wings, whoosh overhead like speeding bullets, and vanish to the south.
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