Ferruginous Hawk Identification Guide

Key Field Marks

• Size & shape: The largest of the North American Buteo hawks, with a long wingspan (up to about 145 cm), broad-based wings, and a relatively small head that give it a distinctive gull- or eagle-like soaring silhouette.
• Light morph (most common): Pale, whitish head and underparts contrast with rich rusty-red ("ferruginous") feathering on the legs and shoulders/back; in flight, look for a pale flight-feather panel and dark, rusty "V" formed by the legs against a white belly.
• Dark morph (uncommon): Overall dark rufous-brown body with paler flight feathers; still shows the long-winged, big shape typical of the species.
• Legs: Feathered all the way to the toes (unlike most buteos), often visibly rusty-colored — a useful mark on perched birds.
• Flight: Soars on wings held in a shallow dihedral (slight V), with slow, powerful wingbeats; frequently hovers or hangs in the wind while hunting over open ground.

Behavior

Hunts over open, treeless terrain, often perching on the ground, fence posts, power poles, or low mounds rather than tall trees. Preys heavily on ground squirrels, prairie dogs, and other small mammals, and is strongly tied to prairie-dog and ground-squirrel colonies.

Similar Species

• Red-tailed Hawk: Smaller-winged and shorter overall, usually shows a dark belly band and rufous tail (adults), lacks the rusty leg feathering and pale-headed look of light-morph Ferruginous Hawk.
• Swainson's Hawk: Slimmer, narrower wings held in a stronger dihedral, typically shows a dark chest band/bib rather than rusty legs, and lacks feathered legs.
• Rough-legged Hawk: Also has feathered legs but is smaller, with a dark carpal patch and dark belly band, and a black terminal tail band; breeds in the Arctic, winters in open country farther south than Ferruginous Hawk's breeding range.

Where & When to Find One

Breeds in arid grasslands, sagebrush steppe, and shortgrass prairie of the interior American West and southern Canadian Prairies, often nesting on cliffs, isolated trees, or artificial structures with a wide view. Many birds are permanent residents or short-distance migrants, moving to the southern Great Plains, Southwest, and northern Mexico in winter. Best looked for scanning open rangeland from roadsides, especially near prairie-dog towns, in spring through fall on the breeding grounds and in winter across the southern portion of its range.

Voice

Gives a harsh, descending "kree-a" or "kaah" alarm call near the nest, similar in quality to other buteos but deeper and huskier; largely silent away from the breeding territory, so identification usually relies on plumage and structure rather than voice.