The highest altitude recorded for a bird is 11,300 m (37,000 ft) for a Rüppell's vulture (Gyps rueppellii), which collided with a commercial aircraft over Abidjan, Ivory Coast on 29 November 1973. The impact damaged one of the aircraft's engines, causing it to shut down, but the plane landed safely without further incident. Sufficient feather remains of the bird were recovered to allow the American Museum of Natural History to make a positive identification of this high-flier, which is rarely seen above 6,000 m (20,000 ft).