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White-throated needletail

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The white-throated needletail (Hirundapus caudacutus), also known as the needle-tailed swift or spine-tailed swift, is a large swift in the genus Hirundapus. It is reputed to reach speeds of up to 170 km/h (110 mph) in horizontal flight, but this is unverified because the methods used to measure its speed have not been published. 75 km/h (47 mph) is more likely, but this is still at least 100 times the bird's length per second.