Field Guide/Birds/Buteo jamaicensis
The Red-tailed Hawk (Buteo jamaicensis) is a large hawk which breeds from western Alaska and northern Canada to Panama and the West Indies. Males are typically smaller than females, generally weighing between 800-1100 grams and measuring 45-56 cm in length. Females typically average between 1100-1300 grams and measure 50-65 cm in length. It is one of two species colloquially known in the United States as the Chickenhawk.
Description
Birds of this species have a dark mark along the leading edge of the underwing, between the body and the wrist (the patagium). Most but not all color variations have a dark band across the belly. In most, the adults' tails are rusty red above, and juveniles have narrow brown and pale bands. The main western North American population has bands on the adults' rusty tails as well and has varied plumage, organized into three main color types or morphs.
Immature birds, or birds that are only a few years old, can also readily be identified by having yellowish pupils. As the bird attains full maturity over the course of 3-4 years, the pupils slowly darken into a reddish-brown hue.
- Light-morph birds are mainly brown on the upperparts and very pale brown or buff on the underparts and underwings; they show a belly band.
- Rufous-morph birds are darker and redder, with reddish-brown rather than white on the underparts. The belly band may be barely visible.
- Dark-morph birds are very dark brown on both upperparts and underparts; they have lighter parts on the underwings.
Almost all of the main eastern population are light-morph, with whiter underparts and paler markings than western birds and with solid rust-red tails as adults.
Other variations are:
- Harlan's Hawk usually has blackish plumage contrasting with white undersides of the flight feathers; the tail may be reddish or grey and is longitudinally streaked rather than barred. It breeds in Alaska and northwestern Canada and winters from Nebraska and Iowa to Texas and northern Louisiana. It is sometimes considered a separate species, Buteo harlani.
- Krider's Hawk is paler than other red-tails, especially on the head; the tail may be pinkish or white. It is mainly found in the central prairies of the United States.
Resident breeding birds in Central America have cinnamon underparts which enables them to be easily distinguished from the paler-breasted wintering migrants.
Behavior
Their breeding habitat is open country with high perches. They build a stick nest in a large tree, in a cactus, or on a cliff ledge 35m or higher above ground; they may also nest on man-made structures. Both sexes build the sturdy nest, made of different sized twigs and sticks, lined with fresh green foliage and evergreen sprigs. The fresh sprigs are regularly replaced during incubation. Up to four eggs may be laid at daily intervals. The shells are colored a dull or bluish-white with a granulated or smooth surface, never glossy. There may be some some splotches of various shades of brown. Incubation is by the female from 28 to 35 days, during which time she is fed by the male. The young are able to fly at about 45 days.
In most of the United States, Red-tailed Hawks are permanent residents, but northern breeding birds migrate south in winter. Throughout their range in the U.S., Red-tailed Hawks receive special legal protections under the Migratory Bird Treaty Act of 1918. They have a complex relationship with humans, capable of both controlling rodent and other mammalian pests, and of on occasion being one, taking valuable fowl (which has led to them being one of the species described as a chickenhawk).
Red-tailed hawks prefer to wait on a high perch and swoop down on prey; they also patrol open areas in flight. They mainly eat small mammals, birds and reptiles. Their favorite prey varies with regional and seasonal availability but includes most types of rodents, rabbits, pheasant, grouse, quail, rattle snakes, copperheads, lizards, and, when near the water's edge, carp and catfish. Those that live in cities may prefer pigeons and starlings, both of which are plentiful in many urban areas.
In flight, these hawks soar with wings in a slight dihedral, flapping as little as possible. They sometimes hover on beating wings and sometimes "kite", or remain stationary above the ground by soaring into the wind. When soaring or flapping their wings, they typically travel from 30kph to 65kph but when diving, they reach speeds as high as 195kph.
The Red-tailed Hawk is common and widespread, partly because it has benefited from the historic settlement patterns across North America. The clearing of trees in the east of North America provided hunting areas, and the practice of sparing woodlots left nest sites. Conversely, the planting of trees in the west provided nest sites where there had been none. The construction of highways with treeless medians and shoulders and with utility poles alongside provided perfect habitat for perch-hunting, so Red-tailed Hawks are now a common sight along highways. Finally, these birds have moved into New York and other US cities, as in the successful non-fiction book Red-Tails in Love: A Wildlife Drama in Central Park, by Marie Winn. Winn wrote about one of the most famous of them, Pale Male.
Trivia
A certain recording of the cry of the Red-tailed Hawk is probably one the most often heard cinematic sound clichés. This high, fierce scream is often featured in the background of adventure movies to give a sense of wilderness to the scene.
Gallery
- Red-tailed Hawk KSC00pp0245.jpg
Adult bird in Florida (This picture is incorrectly labeled as a Red-tailed Hawk. This is actually a juvenile Red-Shouldered Hawk (Buteo lineatus).)
Light morph, in gliding flight
- Redtailedhawkap.jpg
Juvenile eastern race
On fence post in Bexar county, Texas
Bird in San Francisco
Flying over the sea
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References
- Stiles and Skutch, A guide to the birds of Costa Rica ISBN 0-0814-9600-4
External links
- Cornell University Ornithology Lab page about the Red-tailed Hawk, including samples of their cry
- USGS web page about the Red-tailed Hawk
- Red-Tailed Hawks Pictures
fr:Buse à queue rousse it:Buteo jamaicensis ja:アカオノスリ pt:Búteo-de-cauda-vermelha
