Friday, January 18, 2013

Blue Jay


Animal You | Blue Jay | The Blue Jay measures 22-30 cm (9-12 inches) of the bill to tail and weighs 70-100 g (2.5-3.5 oz), with a wingspan of 34-43 cm (13-17 inches). When frightened, the crest bristles outwards shaped brush. When the bird feeds among other jays or resting, is flattened at the top of the head. Its plumage is lavender-blue to mid-blue on top, back, wings and tail, and his face was white. The primary wings and tail are excluded with black, blue and white. Males and females are almost identical. As most of the birds blue tones of blue color pigments derived Jay, but is the result of the interference of light by the internal structure of feathers as a blue pen is ground, the blue disappears as the structure is destroyed.

The Blue Jay comes from southern Canada through the eastern and central U.S. south to northeast Florida and Texas. The western end of the ridge, where it stops the dry forest and scrub species Steller's Jay (C. stelleri) begins. Recently, the range of the Blue Jay northwestern extended so now is a rare winter visitor, but regularly seen along the U.S. northern and southern Pacific coast of Canada. Since the overlap of the two species, since, C. cristata sometimes hybridize with Steller's jay. Miles of tiles were observed in herds migrate along the Great Lakes and the Atlantic coast. A large part of their migratory behavior remains a mystery. Jays youth are more likely to migrate than adults, but many adults migrate. Some individuals jays migrate south one year, continue north to the next winter, then migrate south again next year.

The Blue Jay occupies a variety of habitats within its range, from the pine forests of Florida to the spruce forests of northern Ontario. It is less abundant in the dense forests, preferring mixed forests of oak and beech. The Blue Jay is a passerine strong, brave and aggressive. Almost all raptors sympatric distribution with Blue Jays may precede, especially specialists hunting birds like hawks Accipiter quickly. Several predators may precede the eggs and young Jay in its infancy, including squirrels, snakes, cats, crows, raccoons, opossums, jays and perhaps many other raptors same attack adults. Blue jays can be beneficial to other species, as can raptors, such as hawks and owls, to continue and screaming as they predator in their territory.

Sometimes imitate conversations raptors, especially Red-tailed hawks and red shoulders, perhaps to test whether a hawk is nearby, but perhaps for other birds that may arise scare competition for food resources. It can also be aggressive towards people who are approaching their nests, perches and as an owl in the vicinity of the nest during the day Jay blue mobs until a new stick. However, the Blue Jays also known to attack and kill other birds. Jays are very territorial birds and prosecution of a feeder for an easy meal. Moreover, the blue jay attack the nests of other birds, eggs, chicks, and nest predation. Jays, like other corvids, are highly curious and intelligent birds are considered. The tiles are not very picky about nesting. Also suitable nests of other birds of medium size, provided that they are placed in the right places, the American robins nest often used by the Toronto Blue Jays, for example.

Tiles generally monogamous relationships for life. Both sexes build the nest and raise their young, but not female offspring. Young people after nesting, and feeding the family moved well to early autumn, when the young birds disperse to avoid competition for food during the winter. A joint life expectancy for wild birds that survive to adulthood is approximately seven years.
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