There is some evidence that it also eats carrion when prey is in short supply. The voice of the mature Harris Hawk is typical of the buzzard family - long, harsh screams when disturbed at the nest or otherwise surprised, or when calling for food. Captive bred Harris Hawks, with a history of human contact and accustomed to receiving food from their keepers frequently call with no apparent cause, although this is probably derived from calling for food when young. The Harris Hawk or Bay-Winged Hawk was discovered by the great American naturalist Audubon, and named after his friend Colonel Harris who was with him when he first saw it. In America it is referred to almost always as the Bay-Winged Hawk.
Incubation is about four weeks.
Feather growth is rapid, and by 17 days the feather cover is enough for the young to start wing excercising. The young leave the nest at about 40 days old. Flying demonstrations noon, 2pm and 3.30pm. Call for group rates.