The Harris hawk (Parabuteo unicinctus) was named by John James Audubon, a famous nineteenth century naturalist, after his friend and fellow naturalist Edward Harris. It is dark brown with copper or reddish shoulder patches. It is unique amongst the raptors for hunting in family groups. It has dark brown plumage with chestnut shoulders, wing linings, and thighs, white on the base and tip of the tail, long, yellow legs and a yellow cere. The vocalizations of the Harris's hawk are very harsh sounds. It breeds from the southwestern United States south to Chile, central Argentina, and Brazil.