Thursday, 3 May 2012

Gray wolf


Whale

Whale (origin Old English hwæl) is the common name for various marine mammals of the order Cetacea. The term whale sometimes refers to all cetaceans, but more often it excludes dolphins and porpoises, which belong to suborder Odontoceti (toothed whales). This suborder also includes the sperm whale, killer whale, pilot whale, and beluga whale. The other Cetacean suborder Mysticeti (baleen whales) are filter feeders that eat small organisms caught by straining seawater through a comblike structure found in the mouth called baleen. This suborder includes the blue whale, the humpback whale, the bowhead whale and the minke whale. All Cetacea have forelimbs modified as fins, a tail with horizontal flukes, and nasal openings (blowholes) on top of the head.

Whales range in size from the blue whale, the largest animal known ever to have existed at 30 m (98 ft) and 180 tonnes (180 long tons; 200 short tons), to various pygmy species, such as the pygmy sperm whale at 3.5 m (11 ft).

Whales collectively inhabit all the world's oceans and number in the millions, with annual population growth rate estimates for various species ranging from 3% to 13%. For centuries, whales have been hunted for meat and as a source of raw materials. By the middle of the 20th century, however, industrial whaling had left many species seriously endangered, leading to the end of whaling in all but a few countries.

Thursday, 8 December 2011

Swamp Sparrow


Adults have streaked rusty, buff and black upperparts with a gray breast, light belly and a white throat. The wings are strikingly rusty. Most males and a few females have a rust-colored caps. Their face is gray with a dark line through the eye. They have a short bill and fairly long legs. Immatures and winter adults usually have two brown crown stripes and much of the gray is replaced with buff.
Swamp Sparrows breed across the Northern United States and boreal Canada. The southern edge of their breeding range coincides largely with the Line of Maximum Glaciation. A small number of morphologically distinct birds inhabit tidal marshes from northern Virginia to the Hudson River Estuary. This subspecies (Melospiza georgiana nigrescens) winters in coastal marshes of the Carolinas and differs from the two inland Swamp Sparrow subspecies in having more black in a grayer overall plumage, larger bill, different songs, and a smaller average clutch size.
Their breeding habitat is marshes, including brackish marshes, across eastern North America and central Canada. The bulky nest is attached to marsh vegetation, often with leaves or grass arching over the top. Females give a series of chips as they leave the nest, probably to ward off attacks by their mate or neighboring males.
While Swamp Sparrows can be found in small numbers on the southern edge of their breeding range, individuals are probably all migratory, moving primarily migrate to the southeastern United States.
These birds forage on the ground, in the mud near the water's edge, in shallow water or in marsh vegetation. They mainly eat insects and seeds.
The song of this bird is a slow monotone trill, slower than that of the Chipping Sparrow. A male can have a repertiore of several different trills. The call note is a loud chip reminiscent of a phoebe.