Tuesday, March 29, 2011

White-throated Sparrow

White-throated Sparrow- Spec. Name:  Zonotrichia Albicollis

The White-throated Sparrow is a passerine bird of the American sparrow family Emberizidae. The White-throated Sparrow is 17 cm (6.75 inches) in length with a wingspan of 23 cm (9 inches) Typical weight is 26 grams (0.91 oz)

There are two adult plumage variations known as the tan-striped and white-striped forms. On the white-striped form the crown is black with a white central stripe. The supercilium is white as well. The auriculars are gray with the upper edge forming a black eye line.

On the tan form, the crown is dark brown with a tan central stripe. The supercilium is tan as well. The auriculars are gray/light brown with the upper edge forming a brown eye line. Both variations feature dark eyes, a white throat, yellow lores and gray bill. There is variation and some individuals may show dark lateral stripes of each side of the throat.

They almost always pair with the opposite color morph for breeding. The two color morphs occur in approximately equal numbers. Both male and female white-striped birds are more aggressive than tan-striped birds during the breeding season.

The breast has gray/tan streaks and the streaks continue down the flanks but the belly is generally light gray. The wings are rufous with two distinct white wing bars. Sexes are morphologically similar.

In winter, it migrates to the southern and eastern USA. This bird is a rare vagrant to western Europe.

These birds forage on the ground under or near thickets or in low vegetation. They mainly eat seeds, insects and berries.

There are at least two distinct songs sung by this species. One consists of an initial note, followed by three or so repeated notes at an interval of about a major third above. The second song consists of an initial note, a second a whole step lower, and a third note, repeated 2-3 times, about a minor third below that. This second song is commonly described by use of mnemonics with the cadence of "Po-or Sam Peabody, Peabody, Peabody" (or "O-oh sweet Canada, Canada, Canada") The rhythm is very regular, and the timbre could be described as pinched. These musical intervals are only approximate; to a human ear the song often sounds out of tune. The repeated note will often change in pitch very slightly, contributing to this effect.

The White-throated Sparrow also has at least two calls, in addition to its song.



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Monday, March 28, 2011

Brown Thrasher

Brown Thrasher - Spec. Name:  Toxostoma rufum

This bird sometimes erroneously called the Brown Thrush, is a bird in the Mimidae family, a group that also includes the New World catbirds and mockingbirds.

The Brown Thrasher is bright reddish-brown above with thin, dark streaks on its buffy underparts. Its long rufous tail is rounded with paler corners. Eyes are a brilliant gold. Adults average about 11.5 in (29 cm) long with a wingspan of 13 in (33 cm), and have an average mass of 2.4 oz (68 g)



It is found in thickets and dense brush, often searching for food in dry leaves on the ground. It also enjoys the convergence of mowed to unmowed lawns, particularly if there are ample shrubs or shrubby trees, i.e., fruit orchards that the undergrowth is left undisturbed. It also enjoys perennial gardens and can be seen jumping from the ground to catch insects on flowers and foliage. Its breeding range includes the United States and Canada east of the Rocky Mountains. It is a partial migrant, with northern birds wintering in the southern USA, where it occurs throughout the year. There is a single British record of this unlikely transatlantic vagrant.


This bird is omnivorous, eating insects, berries, nuts and seeds, as well as earthworms, snails, and sometimes lizards.


The female lays 3 to 5 eggs in a twiggy nest lined with grass. The nest is built in a dense shrub or low in a tree. Both parents incubate and feed the young. These birds raise two or three broods in a year. They are able to call in up to 3000 distinct songs. The male sings a series of short repeated melodious phrases from an open perch to defend his territory and is also very aggressive in defending the nest.

Although this bird is widespread and still common, it has declined in numbers in some areas due to loss of suitable habitat

The Brown Thrasher is the official state bird of Georgia, and the inspiration for the name of Atlanta's National Hockey League team, the Atlanta Thrashers.

I see the Brown Thrashers walking around my backyard after rainy days. They're not so easy to spot because they camouflage very well in contrast with the ground and leaves.

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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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