The White-throated Needletail (Hirundapus caudacutus), also known as Needle-tailed Swift or Spine-tailed Swift, is a large swift. It is the fastest-flying bird in flapping flight, with confirmed speeds reaching 111.6 km/h (69.3 mph). It is commonly reputed to reach velocities of up to 170 km/h (105 mph), though this has not been verified.