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Myszołów rdzawosterny
Systematyka
Domena	eukarioty
Królestwo	zwierzęta
Typ	strunowce
Podtyp	kręgowce
Gromada	ptaki
Podgromada	Neornithes
Nadrząd	neognatyczne
Rząd	szponiaste
Podrząd	jastrzębiowce
Rodzina	jastrzębiowate
Podrodzina	myszołowy
Gatunek	myszołów rdzawosterny
Nazwa systematyczna
Buteo jamaicensis
(Gmelin, 1788)
Status ochronny
Kategoria zagrożenia (CzKGZ) EX EW CR EN VU NT LC Kategoria: niższego ryzyka
Galeria zdjęć w Wikimedia Commons

Myszołów rdzawosterny (Buteo jamaicensis) to średniej wielkości ptak z rodziny jastrzębiowatych, występujący w niemal całej Ameryce Północnej, od zachodniej Alaski i północnej Kanady do Panamy i Karaibów. Wyróżniono czternaście podgatunków ptaka, różniących się wyglądem i miejscem występowania. Myszołów rdzawosterny jest jednym z największych przedstawicieli rodzaju Buteo w Ameryce Północnej. Waży od 690 do 2000 gramów i mierzy 45–65 cm. Jego rozpiętość skrzydeł wynosi 110 do 145 cm. U ptaka występuje dymorfizm płciowy - samice są o 25% większe od samców.

Myszołów rdzawosterny zamieszkuje różne środowiska - pustynie, łąki, lasy iglaste i liściaste, lasy deszczowe, tereny zurbanizowane. Jest gatunkiem prawnie chronionym w Kanadzie, Meksyku i Stanach Zjednoczonych.

Gatunek ten należy do najchętniej używanych w sokolnictwie w Stanach Zjednoczonych, z powodu jego rozpowszechnienia i łatwości treningu. Sokolnicy mogą chwytać jedynie jednoroczne osobniki, które nie założyły jeszcze własnego gniazda. Ponadto młode ptaki łatwiej oswoić i wytresować.

Myszołów rdzawosterny jest obecny w kulturze rdzennych Amerykanów. W niektórych plemionach jego pióra są uważane za święte i wykorzystywane podczas ceremonii religijnych.

Spis treści 1 Opis gatunku 2 Taksonomia 3 Środowisko życia 4 Zachowanie 4.1 Pożywienie 4.2 Rozmnażanie 5 Związki z ludźmi 5.1 Sokolnictwo 5.2 Kultura rdzennych Amerykanów 6 Gallery 7 Przypisy 8 External links

[edytuj] Opis gatunku

Samiec myszołowa rdzawosternego mierzy zazwyczaj 45 – 56 cm. i waży 690 - 1300 g. Wymiary samicy to 50 – 65 cm długości i 900 - 2000 g. wagi. Jak u wielu innych drapieżników u tego ptaka występuje wyraźny dymorfizm płciowy - samice są o 25% większe od samców. Rozpiętość skrzydeł wynosi 110 - 145 cm.^[1]

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 rufous. The dark and intermediate morphs constitute 10–20% of the population.^[2]

Though the markings and hue vary, the basic appearance of the Red-tailed Hawk is consistent. The underbelly is lighter than the back and a dark brown band across the belly, formed by vertical streaks in feather patterning, is present in most color variations. The red tail, which gives this species its name, is uniformly brick-red above and pink below.^[3] The bill is short and dark, in the hooked shape characteristic of raptors.^[3] The cere, the legs, and the feet of the Red-tailed Hawk are all yellow.^[1]

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.^[3]

[edytuj] Taksonomia

The Red-Tailed Hawk is a member of the genus Buteo, a group of medium-sized raptors with robust bodies and broad wings. Members of this genus are known as buzzards in Europe, but hawks in North America.^[4]

There are at least 14 recognized subspecies of Buteo jamaicensis, which vary in range and in coloration:

• B. j. jamaicensis, the nominate subspecies, occurs in the northern West Indies, including Jamaica, Hispaniola, Puerto Rico and the Lesser Antilles but not the Bahamas or Cuba. El Yunque National Forest, Puerto Rico holds the highest known density of Red-tailed Hawks anywhere. [1]
• B. j. alascensis breeds (probably resident) from southeastern coastal Alaska to the Queen Charlotte Islands and Vancouver Island in British Columbia.^[5]
• B. j. borealis breeds from southeast Canada and Maine south through eastern Texas west to northern Florida. It winters from southern Ontario east to southern Maine and south to the Gulf coast and Florida.^[5]
• B. j. calurus breeds from central interior Alaska, through western Canada south to Baja California. It winters from southwestern British Columbia southwest to Guatemala and northern Nicaragua.^[5] Paler individuals of northern Mexico may lack the dark wing marking.^[6]
• B. j. costaricensis is resident from Nicaragua to Panama. This subspecies is dark brown above with cinnamon flanks, wing linings and sides, and some birds have rufous underparts. The chest is much less heavily streaked than in northern migrants (B. j. calurus) to Central America.
• B. j. fuertesi breeds from northern Chihuahua to southern Texas. It winters in Arizona, New Mexico, and southern Louisiana.^[5] The belly is unstreaked or only lightly streaked, and the tail is pale.
• B. j. fumosus Islas Marías, Mexico
• B. j. hadropus Mexican Highlands
• B. j. harlani usually has blackish plumage contrasting with white undersides of the flight feathers; the tail may be reddish or gray and is longitudinally streaked rather than barred. The dark wing marking is not distinct. It breeds in Alaska and northwestern Canada and winters from Nebraska and Kansas to Texas and northern Louisiana.^[5]
• B. j. kemsiesi is a dark subspecies resident from Chiapas to Nicaragua. The dark wing marking may not be distinct in paler birds.^[6]
• B. j. kriderii is paler than other Red-tails, especially on the head; the tail may be pinkish or white. In the breeding season, it occurs from southern Alberta, southern Saskatchewan, southern Manitoba, and extreme western Ontario south to south-central Montana, Wyoming, western Nebraska, and western Minnesota. In winter, it occurs from South Dakota and southern Minnesota south to Arizona, New Mexico, Texas and Louisiana.^[5]
• B. j. socorroensis Socorro Island, Mexico
• B. j. solitudinus Bahamas and Cuba
• B. j. umbrinus occurs year-round in peninsular Florida north to Tampa Bay and the Kissimmee Prairie.^[5] It is similar in appearance to calurus

The four island forms, jamaicensis, solitudinus, socorroensis, and fumosus, do not overlap in range with any other subspecies.

[edytuj] Środowisko życia

The Red-tailed Hawk is one of the most widely distributed hawks in the Americas. It breeds from central Alaska, the Yukon, and the Northwest Territories east to southern Quebec and the Maritime Provinces of Canada, and south to Florida, the West Indies, and Central America. The winter range stretches from southern Canada south throughout the remainder of the breeding range.^[5]

Its preferred habitat is mixed forest and field, with high bluffs or trees that may be used as perch sites. It occupies a wide range of habitats and altitudes, including deserts, grasslands, coniferous and deciduous woodlands, tropical rainforests, agricultural fields and urban areas.^[7] It is second only to the Peregrine Falcon in the use of diverse habitats in North America.^[8] It lives throughout the North American continent, except in areas of unbroken forest or the high Arctic.^[2]

The Red-tailed Hawk is widespread in North America,^[8] partially due to historic settlement patterns, which have benefited it. The clearing of forests in the Northeast created hunting areas, while the preservation of woodlots left nest sites. The planting of trees in the west allowed the Red-tailed Hawk to expand its range by creating nest sites where there had been none. The construction of highways with utility poles alongside treeless medians provided perfect habitat for perch-hunting. The Red-tailed Hawk can also be found in cities.^[9] The non-fiction book Red-Tails in Love: A Wildlife Drama in Central Park by Marie Winn made Pale Male, a Red-tailed Hawk in New York, the most famous urban Red-tailed Hawk.^[10]

[edytuj] Zachowanie

In flight, this hawk soars with wings in a slight dihedral, flapping as little as possible to conserve energy. Active flight is slow and deliberate, with deep wing beats. In wind, it occasionally hovers on beating wings and remains stationary above the ground.^[2] When soaring or flapping its wings, it typically travels from 20 to 40 mph, but when diving may exceed 120 mph.^[11] When the Red-tailed Hawk walks, its steps are slow and awkward.

The Red-tailed Hawk is generally non-aggressive toward people and toward other birds. It is commonly harassed by crows, magpies, owls, other hawks, and even songbirds over territorial disputes, though it is generally not injured. When threatened by a human intruder, a Red-tailed Hawk will generally flee rather than defend its nest.^[12]

The cry of the Red-tailed Hawk is a two to three second hoarse, rasping scream, described as kree-eee-ar,^[9] which begins at a high pitch and slurs downward^[11] This cry is often described as sounding similar to a steam whistle.^[1] It frequently vocalizes while hunting or soaring, but vocalizes loudest in annoyance or anger, in response to a predator or a rival hawk's intrusion into its territory.^[9] At close range, it makes a croaking "guh-runk".^[12] Young hawks may utter a wailing klee-uk food cry when parents leave the nest. ^[13]

Because of its robust crispness, a certain recording of the cry of the Red-tailed Hawk is a cliché cinematic sound effect. This high, piercing scream is often featured in the background of adventure movies to give a sense of wilderness to the scene. However, the cry is sometimes inaccurately used for the Bald Eagle, whose own vocalizations are quite different and less robust.

[edytuj] Pożywienie

The Red-tailed Hawk is carnivorous, and an opportunistic feeder. Its diet is mainly small mammals, but it also includes birds and reptiles. Prey varies with regional and seasonal availability, but usually centers on small rodents. Additional prey include rabbits, snakes, waterfowl, bats, shrews, crustaceans, insects, and fish.

The Red-tailed Hawk hunts primarily from an elevated perch site, swooping down from a perch to seize prey, catching birds while flying, or pursuing prey on the ground from a low flight.^[14]

Prey range in size from beetles to White-tailed Jackrabbits, which are double the weight of most Red-tails. In captivity in winter, an average Red-tail will eat about 135 g (4-5 oz) daily.^[13] The Great Horned Owl occupies a similar ecological niche nocturnally, taking similar prey. Competition may occur between the Red-tailed Hawk and the Great Horned Owl during twilight.

[edytuj] Rozmnażanie

The Red-tailed Hawk reaches sexual maturity at two years of age. It is monogamous, mating with the same individual for many years. In general, the Red-tailed Hawk will only take a new mate when its original mate dies.^[14] The same nesting territory may be defended by the pair for years. During courtship, the male and female fly in wide circles while uttering shrill cries. The male performs aerial displays, diving steeply, then climbing again. After repeating this display several times, he sometimes grasps her talons briefly with his own. Courtship flights can last 10 minutes or more. Copulation often follows courtship flight sequences, although copulation frequently occurs in the absence of courtship flights.

In copulation, the female, when perched, tilts forward, allowing the male to land with his feet lodged on her horizontal back. The female twists and moves her tail feathers to one side, while the mounted male twists his cloacal opening around the to the female's cloaca. Copulation lasts 5 to 10 seconds and during pre-nesting courtship in late winter or early spring can occur numerous times each day.^[15]

In the same period, the pair constructs a stick nest in a large tree 4 to 21 m off the ground or on a cliff ledge 35 m (115 ft) or higher above the ground, or may nest on man-made structures. The nest is generally 71 to 97 cm (28 to 38 inches) in diameter and can be up to 90 cm (3 feet) tall. The nest is constructed of twigs, and lined with bark, pine needles, corn cobs, husks, stalks, aspen catkins, or other plant lining matter.

Great Horned Owls compete with the Red-tailed Hawk for nest sites. Each species has been known to kill the young and destroy the eggs of the other, but in general, both species nest in adjacent or confluent territories without conflict. Great Horned Owls are incapable of constructing nests and typically expropriate existing Red-tail nests. Great Horned Owls begin nesting behaviors much earlier than Red-tails, often as early as December. Red-tails are therefore adapted to constructing new nests when a previous year's nest has been overtaken by owls or otherwise lost. New nests are typically within a kilometer or less of the previous nest. Often, a new nest is only a few hundred meters or less from a previous one.

A clutch of 1 to 3 eggs is laid in March or April, depending upon latitute. Clutch size depends almost exclusively on the availability of prey for the adults. Eggs are laid approximately every other day. The eggs are usually about 60 x 47 mm (2.4 x 1.9 in). They are incubated primarily by female, with the male substituting when the female leaves to hunt or merely stretch her wings. The male brings most food to the female while she incubates. After 28 to 35 days, the eggs hatch over 2 to 4 days; the nestlings are altricial at hatching. The female broods them while the male provides most of the food to the female and the young, which are known as eyasses (pronounced "EYE-ess-ess"). The female feeds the eyasses after tearing the food into small pieces. After 42 to 46 days, the eyasses begin to leave the nest on short flights. The fledging period lasts up to 10 weeks, during which the young learn to fly and hunt.^[1]

[edytuj] Związki z ludźmi

The Red-tailed Hawk has a complex history with humans. The name "chickenhawk" was applied to the Red-tailed Hawk in earlier times, when free-ranging chickens and other domestic fowl were occasionally taken by these birds. First-year Red-tails, usually in late summer or early fall, were the most guilty of such predation. After mid-summer, adults seldom provide food for newly-hunting young Red-tails, and easily-captured, flightless chickens at a farmstead were frequent targets. Today, Red-tails and other hawks are universally protected by state, provincial, and federal bird protection laws.

[edytuj] Sokolnictwo

The Red-tailed Hawk is a popular bird in falconry, particularly in America where the sport of falconry is tightly regulated at the federal and state levels. There are fewer than 4,000 falconers in the United States, therefore any effect on the Red-tailed Hawk population, estimated to be approximately one million in the United States, is statistically insignificant.^[16]

The Red-tailed Hawk is adaptable and useful in modern falconry. It is a powerful and sturdy falconry bird best flown at larger ground quarry such as squirrels, rabbits, and jackrabbits. Occasionally, the Red-tailed Hawk may even take a pigeon, crow, or duck,

In the course of a hunt, a falconer using a Red-tailed Hawk most commonly releases the hawk and allows it to perch in a tree or other high vantage point. The falconer, who may be aided by a dog, then attempts to flush prey by stirring up ground cover. A well-trained Red-tailed Hawk will follow the falconer and dog, realizing that their activities produce opportunities to catch game. Once a raptor catches game, it does not bring it back to the falconer. Instead, the falconer must locate the bird, "make in," and trade the bird its kill in exchange for a piece of ready-to-eat meat, which is generally from a previous kill.^[17]

[edytuj] Kultura rdzennych Amerykanów

The feathers and other parts of the Red-tailed Hawk are considered sacred to many American indigenous people and, like the feathers of the Bald Eagle and Golden Eagle, are sometimes used in religious ceremonies and found adorning the regalia of many Native Americans in the United States; these parts, most especially their distinctive tail feathers, are a popular item in the Native American community.^[18] As with the other two species, the feathers and parts of the Red-tailed Hawk are regulated by the eagle feather law,^[19] which governs the possession of feathers and parts of migratory birds.^[20]

[edytuj] Gallery

	Redtailedhawkap.jpg Juvenile eastern race	Immature (facing camera) and adult western race (calurus) squabbling over a kill	Immature with a kill
N216600067 30401220 8411.jpg Mature closeup with kill,	N216600067 30401219 7476.jpg Hawk with squirrel	Red-tailed hawk in SF CA.jpg	Red Tail Hawk.JPG Immature Red-tail on typical roadside hunting perch.
Red-tailed hawk preening.jpg Preening	Red tail.jpg Red Tailed Hawk spreading its wings in Manitoba, Canada	Red Tail Hawk in Tx.

Przypisy

[edytuj] 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
• South Dakota Birds - Red-tailed Hawk Information and Photos
• Religious Freedom with Raptors
• North American Falconers Association
• Comparison of Adult & Immature tails
• Discussion of Krider's and Harlan's forms and identification issues
• Red-tailed Hawks of the Ridgefield National Wildlife Refuge