Showing posts with label Birds of Prey. Show all posts
Showing posts with label Birds of Prey. Show all posts

Friday, April 1, 2011

Merlin

Merlin - Spec. Name: Falco columbarius

This is a small species of falcon from the Northern Hemisphere. A bird of prey sometimes known colloquially as a pigeon hawk in North America,[1] the Merlin breeds in the northern Holarctic; some migrate tosubtropical and northern tropical regions in winter.

Merlin
The Merlin is 24–33 cm (9.5–13 in) long with a 50–67 cm (20–26 in) wingspan. Compared to other small falcons, it is more robust and heavily built. Males average at about 165 g (5.8 oz) and females are typically about 230 g (8 oz). There is considerable variation, however, throughout the birds' range and—in particular in migratory populations—over the course of a year. Thus, adult males may weigh 150-210 grams (5.3-7.4 oz), and females 190-255 grams (6.7-9 oz). Such sexual dimorphism is common among raptors; it allows males and females to hunt different prey animals and decreases the territorysize needed to feed a mated pair.

The male Merlin has a blue-grey back, ranging from almost black to silver-grey in different subspecies. Its underparts are buff- to orange-tinted and more or less heavily streaked with black to reddish brown. The female and immature are brownish-grey to dark brown above, and whitish buff spotted with brown below. Besides a weak whitish supercilium and the faint dark malar stripe – which are barely recognizable in both the palest and the darkest birds –, the face of the Merlin is less strongly patterned than in most other falcons. Nestlings are covered in pale buff down feathers, shading to whitish on the belly.
The remiges are blackish, and the tail usually has some 3-4 wide blackish bands, too. Very light males only have faint and narrow medium-grey bands, while in the darkest birds the bands are very wide, so that the tail appears to have narrow lighter bands instead. In all of them, however, the tail tip is black with a narrow white band at the very end, a pattern possibly plesiomorphic for all falcons. Altogether, the tail pattern is quite distinct though, resembling only that of theAplomado Falcon (F. berigora) and (in light Merlins) some typical kestrels. The eye and beak are dark, the latter with a yellow cere. The feet are also yellow, with black claws.
Light American males may resemble the American Kestrel (F. Sparverius, not a typical kestrel), but merlin males have a grey back and tail rather than the reddish-brown of the kestrels. Light European males can be distinguished from kestrels by their mainly brown wings. In the north of South Asia, wintering males may be confused with the Red-necked Falcon (F. chicquera) if they fly away from the observer and the head (red on top in F. chicquera) and underside (finely barred with black in F. chicquera) are not visible.


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Sunday, March 27, 2011

Cooper's Hawk

Cooper's Hawk - Spec. Name: Accipiter Cooperii

This is a medium-sized hawk native to the North American continent and found from Canada to Mexico. As in many birds of prey, the male is smaller than the female. The birds found east of the Mississippi River tend to be larger on average than the birds found to the west.

Cooper's Hawk was first described by French naturalist Charles Lucien Bonaparte in 1828. It is a member of the goshawk genus Accipiter. This bird was named after the naturalist William Cooper, one of the founders of the New York Lyceum of Natural History (later the New York Academy of Sciences) in New York. Other common names; Big Blue Darter, Chicken Hawk, Hen Hawk, Mexican Hawk, Quail Hawk, Striker and Swift Hawk.

The average size of an adult male ranges from 280 to 350 g with a length between 35 and 46 cm. The adult male is significantly smaller than the average female, which are 440 to 570 g and 42 to 50 cm long. Individuals living in the eastern regions tend to be larger and heavier than those in the western regions. All have short rounded wings and a very long tail with dark bands, round-ended at the tip. Adults have red eyes and have a black cap, with blue-gray upper parts and white underparts with fine, thin, reddish bars. Their tail is blue gray on top and pale underneath, barred with black bands. Immatures have yellow eyes and have a brown cap, with brown upper parts and pale underparts with thin black streaks mostly ending at the belly. Their tail is brown on top and pale underneath, barred with dark bands. The eyes of this hawk, as in most predatory birds, face forward, enabling good depth perception for hunting and catching prey while flying at top speeds. They have hooked bills that are well adapted for tearing flesh of prey. Immatures are somewhat larger than a Sharp-shinned Hawk and smaller than a Northern Goshawk, though small males nearly overlap with large female Sharp-shinned Hawks, and large female Cooper's Hawks nearly overlap with small male Goshawks. The Cooper's Hawk appears long-necked in flight and has been described by birdwatchers as looking like a "flying cross". The Cooper’s Hawk is seen mostly flying with quick, consecutive wing beats and a short glide, though they may also soar. Distribution and habitat Their breeding range extends from southern Canada to northern Mexico. They are generally distributed more to the south than the other North American Accipiters, the Sharp-shinned Hawk and the Northern Goshawk. Birds from most of the Canadian and northern-U.S.-range migrate in winter, and some Cooper's Hawks winter as far south as Panama). The Cooper’s Hawk occur in various types of mixed deciduous forests and open woodlands, including small woodlots, riparian woodlands in dry country, open and pinyon woodlands, and forested mountainous regions and also now nests in many cities. They were once thought to be adverse to cities and towns, but are now fairly common urban and suburban birds. The cities provide plenty Rock Pigeon and Mourning Dove for the Cooper’s Hawk to prey on.

These birds capture prey from cover or while flying quickly through dense vegetation, relying almost totally on surprise. One study showed that this is a quite dangerous hunting style. More than 300 Cooper’s Hawk skeletons were investigated and 23% revealed healed fractures in the bones of the chest. Most prey are mid-sized birds, with typical prey including American Robins, jays,woodpeckers, European Starlings,quail, icterids and doves. Birds preyed on can range in size from wood-warblers to Ring-necked Pheasants. They may also prey upon the raptor American Kestrel. They have been known to rob nests and also eat small mammals like chipmunks, hares, mice, squirrels, and bats. Other possibilities are lizards, frogs, snakes and large insects. It normally catches its prey with its feet and kills it by repeatedly squeezing it and holding it away from its body until it dies. They have also been seen drowning their prey, holding it underwater until it stops moving. The hawks, in addition, often pluck the feathers off their prey on a post or other perch. They are increasingly seen hunting smaller songbirds in backyards with feeders. They will perch in trees overlooking the feeders, then swoop down and scatter the other birds in order to capture one in flight. These hawks can also pursue their prey on the ground by half running and half flying.


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Thursday, March 24, 2011

Vultures: Turkey & King

Turkey Vulture - Spec. Name: Cathartes Aura


Bill: Slightly hooked, white or cream color
Size: 28-32 inches long with 70-inch wingspan, long neck
Colors: Black, gray, white, red, pink, brown
Markings: Male and female birds are similar with overall brown-black plumage. Some gray or white may show on the wings of perched birds but is much more prominent in the bi-colored pattern seen in flight with a dark leading edge and white or gray trailing edge and fingertips. The head is bare and red with white or greenish warts below and in front of the eye. The legs are pale red or pink.
Brown Turkey Vulture
These large birds feed on carrion generally.
Turkey vultures are fairly common and widespread throughout all types of habitats in the United States and the southern edge of Canada in the summer. Populations in the northern and mountain states as well as the Great Plains migrate seasonally, while turkey vultures in the Southeast and along the Pacific Coast may remain all year. These birds are year-round residents throughout the Caribbean, Mexico and Central and South America.
Black Turkey Vulture

These birds with their long, broad wings are majestic fliers and can soar for hours searching for food. Their flight pattern is easily recognized by the wings held in a slight V shape and rocking back and forth as they scan for a meal. Turkey vultures have extraordinary sight and are one of the few birds to have a highly developed sense of smell, which is useful when locating food. Flocks of turkey vultures can often be found at carcasses and they will also roost in flocks at night. When not soaring or feeding, these birds often spread their wings to sun.

These are monogamous birds and a mated pair will produce one brood of 1-3 eggs annually. Both parents incubate the young birds for 38-40 days, and they will feed the young birds via regurgitation for 65-85 days until the juveniles are ready to leave the nest.
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King Vulture - Spec. Name: Sarcoramphus Papa,  
King Vulture

Large bird found in Central and South America. It is a member of the New World vulture family Cathartidae. This vulture lives predominantly in tropical lowland forests stretching from southern Mexico to northern Argentina, though some believe that William Bartram's Painted Vulture of Florida may be of this species. It is the only surviving member of the genus Sarcoramphus, although fossil members are known.
Large and predominantly white, the King Vulture has gray to black ruff, flight, and tail feathers. The head and neck are bald, with the skin color varying, including yellow, orange, blue, purple, and red. The King Vulture has a very noticeable yellow fleshy caruncle on its beak. This vulture is a scavenger and it often makes the initial cut into a fresh carcass. It also displaces smaller New World vulture species from a carcass. King Vultures have been known to live for up to 30 years in captivity.
King Vultures were popular figures in the Mayan codices as well as in local folklore and medicine. Although currently listed as Least Concern by the IUCN, they are decreasing in number, due primarily to habitat loss.

Saturday, March 12, 2011

Bird of Prey


The very first time I saw a Red-shouldered Hawk ( Bufeo Lineatus) I was very impressed by the size and stunning beauty. I remember that he landed right on top of a vole (Field rodent) and grabbed it with his great talons, then killed it and swallowed it whole! Powerful bird, great flyer with acute eyesight.














This species of hawks are well known all across USA, at certain times these birds fly in large flocks. Many name the red-shouldered Hawk as the most skilled flyers.