Harris’s Hawk

Identification

Harris's hawk is a medium-large raptor roughly intermediate in size between a peregrine falcon and a red-tailed hawk, measuring 46–59 cm in length with a wingspan of about 103–120 cm. It displays distinctive dark brown plumage with chestnut shoulders, wing linings, and thighs. The tail is particularly characteristic, featuring white bands at both the base and tip. Long yellow legs and a yellow cere complete the striking appearance. Sexual dimorphism is pronounced, with females approximately 35% larger than males.

Juveniles appear considerably lighter than adults, heavily streaked with white or buff on the underparts. In flight, young birds show buff-colored undersides with brown streaking and whitish primary feathers creating a pale panel on the outer wing. Despite these differences, the identical chestnut plumage aids identification. The two subspecies differ subtly: the southern P. u. unicinctus is smaller with proportionately longer tail and wings, darker brown ventrum streaked with white, and patterned lighter wing undersides, while the northern P. u. harrisi has broader white tail bands and completely dark mature wing undersides.

Range & Habitat

Harris's hawk breeds from the southwestern United States south through Central and South America to Chile, central Argentina, and Brazil. The two subspecies' ranges overlap in northern South America, coexisting as far south as Peru. These birds are permanent residents and do not migrate. The species inhabits sparse woodland and semi-desert environments, and in parts of their South American range they occupy marshes with scattered trees, including mangrove swamps. Important habitat features include scattered larger trees, utility poles, woodland edges, standing dead trees, and prominent geological features like boulders and saguaros that serve as perches and nest supports.

Sadly, wild populations are declining due to habitat loss, though under certain circumstances the species has demonstrated the ability to adapt to developed areas.

Behaviour & Diet

Harris's hawk is remarkable for its cooperative hunting behavior—a strategy virtually unique among birds of prey. These hawks occur in relatively stable social groups typically comprising two to seven individuals, with a clear dominance hierarchy led by the mature female, followed by the adult male and then young from previous years. Birds cooperate not only in hunting but also assist in nesting activities. This exceptional sociability has been attributed to their intelligence, making them exceptionally easy to train and popular in falconry.

Social behavior is most thoroughly documented in the northern subspecies, where larger individual size and more pronounced social behaviors occur in the harsher southwestern U.S. environment compared to the southeastern U.S. The species produces very harsh vocalizations. In the wild, lifespan averages 10–12 years, though captive birds have been recorded living up to 25 years.

Best Time & Places to See It

Harris's hawks are year-round permanent residents throughout their range, making them observable in all seasons. In North America, the southwestern United States offers the best viewing opportunities, particularly in semi-desert and sparse woodland habitats. In South America, the species can be found throughout its range from northern regions south to the southern cone countries. Look for them perched on scattered large trees, utility poles, or other prominent features overlooking open or semi-open terrain where they hunt cooperatively.

Photography Tips

The distinctive white tail bands with dark feathering provide an excellent identification feature to capture in photographs. When photographing these birds in flight, pay particular attention to the wing undersides and tail patterns, which differ between subspecies and between adults and juveniles. The chestnut shoulders and wing linings are diagnostic and photograph well in side and perched views. The bright yellow legs and cere offer vivid color contrast against the dark plumage. Photographing cooperative hunting behavior, while challenging, would be exceptional; position yourself to capture multiple individuals in frame during group activities.