Greetings and welcome to my blog, I am currently redesigning the site so some of my pictures are unfortunately missing because I had to close my sellers account that I had with the Smugmug site because as a free lance photographer I just couldn't afford it.
Once again I apologize for the bareness of my blog and will be working on it continually until I get it restored.
Thank you for your patience! -Megan

Monday, July 30, 2012

Cooper's Hawk photos


These are photos that I captured yesterday on my family’s ranch. They are of an Immature female Cooper’s Hawk. We were outside enjoying our evening on the porch when we noticed that all of the birds in the area were really making a racket, after a while of looking to see what was causing the disturbance we finally spotted the Hawk perched in up in the Mesquite tree. I am thankful that she let me get up close enough to her to get a few shots. You can also purchase prints and products featuring these photos here My Website






Cooper's Hawk  (Accipiter cooperii) is a medium-sized hawk native to the North American continent and found from Southern Canada to Northern 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.

Taxonomy:

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

Description:

The average size of an adult male ranges from 7.8 to 14 oz with a length between 14 and 18 in. The adult male is significantly smaller than the average female, which weigh 12 to 25 oz and measure 17 to 20 in long. Its wingspan ranges from 24 to 37 in. Individuals living in the eastern regions, where the sexes average 12.3 oz and 20.0 oz, tend to be larger and heavier than those in the western regions, where the respective sexes average 9.9 oz and 16 oz. Cooper's Hawks have short rounded wings, the wing chord measuring 8.4–10.9 in. long, and a relatively long tail, 6.7–8.1 in. long, with dark bands, round-ended at the tip. As in most Accipiters, the tarsus is relatively long, measuring 2.2–3.0 in long, and the bill is relatively small, with the culmen from the cere measuring only 0.59–0.83 in.

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.

Feeding:

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. Cooper's Hawks prey almost exclusively on small to mid-sized birds. Typical prey species include American Robins, other thrushes, jays, woodpeckers, European Starlings, quail, icterids, cuckoos, pigeons 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 and other smaller raptors, including their cousin the Sharp-shinned Hawk.

 They have been known to rob nests and may supplement their diet with small mammals such as chipmunks, hares, mice, squirrels, and bats. Even more rarely, they may predate on lizards, frogs, or snakes. 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 have been 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.

Courtship and breeding :

Cooper’s hawks are monogamous and mate for life. Their breeding habitats are forested areas. The breeding pair builds a stick nest in large trees. Over a two week period the pair builds the nest. The nests are piles of sticks around 27 inches in diameter and 6- 17 inches high with a cup- shaped depression in the middle that is 8 inches across and 4 inches deep. Their nests are built in pines, oaks, Douglas- firs, beeches, spruces, and other tree species usually on flat ground rather than on a hillside. The nests typically are about 25–50 feet high off the ground, halfway up the tree, and out on a horizontal branch. The clutch size is usually 3 to 5 eggs. The cobalt-blue eggs average about 1.9 x 1.5 in. and weigh about 1.5 oz. The female incubates the eggs between 30 to 36 days. The hatchlings are about,  1 oz. and 3.8 in. long and are completely covered in white down. They are brooded for about two weeks by the female, while her mate forages for food. The fledging stage is reached at 25 to 34 days of age, though the offspring will return to the nest to be fed until they become independent around 8 weeks. Eggs and nestlings are preyed on, rarely, by raccoons, crows as well as other competing Cooper's Hawks. Adults rarely fall prey to larger raptors.

Conversation and Lifespan:

Cooper’s Hawks communicate using vocalizations and displays. Vocal is probably preferred over display, because the denseness of their habitat could prevent displays from being seen from a distance. Males are usually submissive to females and will listen for reassuring call notes the females make when they are willing to be approached. The males have a higher pitched voice than females.

Cooper’s Hawks have been known to live as long as 12 years in the wild. However, the oldest known living hawk was 20 years and 4 months old.

Status and Conservation:

At one time, Cooper's Hawks were heavily hunted in persecution for preying on poultry and were called "chicken hawks". It is now known that predation by these hawks on domestic animals borders are negligible, and they are rarely hunted these days. Cooper's Hawks' breeding success was also reduced by the use of the pesticide DDT, but the ban of DDT ended that threat. Since then, the adaptable Cooper's Hawk has thrived. However, one threat facing Cooper’s Hawks today is the degradation and loss of habitat. Management activities like logging may make their former habitat unsuitable for breeding.

No comments:

Post a Comment