Showing posts with label hawk. Show all posts
Showing posts with label hawk. Show all posts

Monday, January 30, 2012

Meet the Shikra

Shikras (Accipiter badius) are birds of prey native to many parts of Asia and Africa. As members of the same family as goshawks, shikras are sometimes referred to as little banded goshawks.

Usually less than a foot long, shikras are quite small for birds of prey. Male shikras can be identified by their red eyes and pale grey plumage, whereas females are darker brown and have yellow eyes. Both sexes have short, rounded wings and long tails. There are six known subspecies of shikra that differ somewhat in size, appearance, and range.

Photo Copyright: Avadhesh Malik
Shikras usually hunt from perches such as tree branches, swooping down to grab common prey animals such as birds, lizards, and bats. Ariel pursuits of birds may happen occasionally, but smaller birds are often able to escape through dense brush in more heavily forested areas.

Breeding season for shikras usually occurs anywhere between January and June depending on location and in some portions of Africa may take place at any time of year. Most shikras lay anywhere from 2-4 eggs that hatch roughly a month later. Chicks are ready for fledging roughly a month after being born. Shikras have a stable global population of roughly one million, and are not currently considered threatened.

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Friday, December 9, 2011

The Turkey Vulture

One of the most common large birds in many parts of North America, the majestically-soaring turkey vulture is rarely as appreciated as eagles, hawks, or even the closely-related California condor.
Part of the reason the turkey vulture never gets its due may have to do with its looks. The bird gets its name from its bald head and dark plumage resembling that of a wild turkey. However, once this vulture spreads its six foot wings and begins soaring, it’s obvious this is no turkey.
Often incorrectly referred to as buzzards, which is actually a European term for many buteo species of hawks, turkey vultures can be found throughout South America, Central America, and southern parts of the United States year-round; in warmer months they may live as far north as Canada. They primarily live in large roosts of up to several hundred birds and prefer open country over heavily forested areas.

Turkey vultures are scavengers that feed almost exclusively on carrion. By removing and consuming animal carcasses, they perform an important role in local ecosystems by reducing the spread of disease.

Turkey vultures are sometimes unjustly blamed for killing newborn cattle. In reality, this is usually the work of the black vulture, a similarly-sized bird that sometimes does roost with turkey vultures.

Though not currently endangered or threatened, the turkey vulture is protected under Migratory Bird Treaty Act of 1918. Killing or possessing a turkey vulture can result in a $15,000 fine and six months in prison.

Wednesday, September 21, 2011

The Golden Eagle - Apex Predator

The golden eagle is the largest bird of prey in North America, and with a range that includes most of the northern hemisphere, the most widespread eagle on earth.
Photo: Jason Hickey
With a wingspan of over seven feet and weighing up to 15lbs, an adult golden eagle will not be mistaken for a smaller hawk or falcon. Golden eagles live in areas of open country such as desert and sparse forests. They usually build a nest of sticks on a cliff ledge or occasionally in a tree. This nest will be the home for a mated pair of golden eagles for life and they will enlarge and repair the nest as necessary.

The vast majority of the golden eagle’s diet consists of small to medium-sized mammals such as hares, marmots and young deer. Other major food sources include birds such as pheasants, grouse, falcons and hawks, as well as any available carrion.
Due to their massive size, healthy adult golden eagles have no natural predators of their own. They have been known to get mobbed by groups of smaller hawks and falcons when they invade a nesting area though. A healthy golden eagle can live for 30 years in the wild.
By far the greatest threat to golden eagles comes from habitat loss. Once thriving golden eagle populations in Europe are now severely restricted, and though still common in much of North America and Asia, populations continue to decline in areas with an increasing human presence.

Tuesday, September 6, 2011

Flying Squirrels - Animal Hang Gliders

Despite their name, flying squirrels not actually capable of powered flight. Instead, they use a furry patch of skin between their wrists and ankles as a sort of parachute, allowing them to glide hundreds of feet between trees.
There are 44 species of flying squirrel spread throughout almost every temperate climate in the world. Though habitats vary by species, most can be found in woodland areas where tall trees can help the squirrels avoid ground-based predators.

Unlike ground squirrels and tree squirrels, flying squirrels are almost completely nocturnal. This behavior is one of necessity as they are unable to escape from large birds of prey such as hawks and eagles during the day. However, they are still exposed to predation from several species of owls at night.
Flying squirrels are omnivorous and vary their diet based upon what is available. Common food sources include many types of nuts, fungi and berries as well as small insects and bird eggs. Like all squirrels, flying squirrels do not hibernate and can live in dens of up to 50 individuals during cold winter months, usually in hollowed out trees or abandoned bird nests.