The Red-tailed Hawk (Buteo
jamaicensis) is a bird of prey, one of three species colloquially known
in the United States as the "chickenhawk," though it rarely preys on
standard sized chickens. It breeds throughout most of North America,
from western Alaska and northern Canada to as far south as Panama and
the West Indies, and is one of the most common buteos in North America.
Red-tailed Hawks can acclimate to all the biomes within their range.
There are fourteen recognized subspecies, which vary in appearance and
range. It is one of the largest members of the genus Buteo in North
America, typically weighing from 690 to 1,600 g (1.52 to 3.53 lb) and
measuring 45–65 cm (18–26 in) in length, with a wingspan from 110–145 cm
(43–57 in). The Red-tailed Hawk displays sexual dimorphism in size,
with females averaging about 25% heavier than males.
The
Red-tailed Hawk occupies a wide range of habitats and altitudes,
including deserts, grasslands, coniferous and deciduous forests,
tropical rainforests, agricultural fields and urban areas. It lives
throughout the North American continent, except in areas of unbroken
forest or the high arctic. It is legally protected in Canada, Mexico and
the United States by the Migratory Bird Treaty Act.
Because they
are so common and easily trained as capable hunters, the majority of
hawks captured for falconry in the United States are Red-tails.
Falconers are permitted to take only passage hawks (which have left the
nest, are on their own, but are less than a year old) so as to not
affect the breeding population. Adults, which may be breeding or rearing
chicks, may not be taken for falconry purposes and it is illegal to do
so. Passage red-tailed hawks are also preferred by falconers because
these younger birds have not yet developed adult behaviors, which will
make training substantially more challenging.
A male Red-Tailed
Hawk may weigh from 690 to 1,300 g (24 to 46 oz), with a mean weight of
1,030 g (36 oz), and measure 45–60 cm (18–24 in). A female can weigh
between 900 and 2,000 g (32 and 71 oz), averaging 1,220 g (43 oz), and
measure 48 to 65 cm (19 to 26 in) long. The wingspan can range from 105
to 141 cm (41 to 56 in) and, in the standard scientific method of
measuring wing size, the wing bone is 33–44 cm (13–17 in) long. The tail
measures 19–25 cm (7.5–9.8 in) in length. The exposed culmen was
reported to average 2.5–2.7 cm (0.98–1.06 in) and the tarsus averaged
8.6–9 cm (3.4–3.5 in). As is the case with many raptors the Red-tailed
Hawk displays sexual dimorphism in size, as females are up to 25% larger
than males.
Red-tailed Hawk plumage
can be variable, depending on the subspecies and the region. These
color variations are morphs, and are not related to molting. The western
North American population, B. j. calurus, is the most variable
subspecies and has three color morphs: light, dark, and intermediate or
rufus. The dark and intermediate morphs constitute 10–20% of the
population.
Though the markings and hue vary across the
subspecies, the basic appearance of the Red-tailed Hawk is consistent.
Overall, this species is blocky and broad in shape, often appearing (and
being) heavier than other Buteos of similar length. A whitish
underbelly with a dark brown band across the belly, formed by horizontal
streaks in feather patterning, is present in most color variations.
Especially in younger birds, the underside may be otherwise covered with
dark brown spotting. The red tail, which gives this species its name,
is uniformly brick-red above and light buff-orange below. The bill is
short and dark, in the hooked shape characteristic of raptors, and the
head can sometimes appear small in size against the thick body frame.
They have a relatively short, broad tails and thick, chunky wings. The
cere, the legs, and the feet of the Red-tailed Hawk are all yellow.
Immature
birds can be readily identified at close range by their yellowish
irises. As the bird attains full maturity over the course of 3–4 years,
the iris slowly darkens into a reddish-brown hue. In both the light and
dark morphs, the tail of the immature Red-tailed Hawk are patterned with
numerous darker bars.