A bird's velocity is necessarily variable; a hunting bird will reach much greater speeds while diving to catch prey than when flying horizontally.
The bird that can achieve the greatest airspeed is the peregrine falcon (Falco peregrinus), able to exceed 320 km/h (200 mph) in its dives.
[1][2] A close relative of the common swift, the white-throated needletail (Hirundapus caudacutus), is commonly reported as the fastest bird in level flight with a reported top speed of 169 km/h (105 mph).
This record remains unconfirmed as the measurement methods have never been published or verified.
The record for the fastest confirmed level flight by a bird is 111.5 km/h (69.3 mph) held by the common swift.