Kamis, 13 Desember 2012

Great Blue Heron


The Biggest Animals Kingdom and in The World | Great Blue Heron | It is the largest North American heron herons and among all existing, surpassed only by the Goliath heron and white-bellied heron. Head-to-tail length of 91-137 cm (36-54 inches), with a magnitude of 167-201 cm (66-79 inches), a height of 115-138 cm (45-54 inches) and a weight 2, 1 to 3.6 kg (4.6 to 7.9 pounds). Notable features include slate flight feathers, red-brown, red-brown thighs, and a band of black couple and sides, the neck is rusty gray, with black and white stripes on the front, the head is almost white pale face, and a pair of black feathers vary from just above the eye to the back of the head. Immature birds are duller in color, with a dull blackish-gray crown, and the pattern of side weakly defined, without feathers, and the bill is dull gray-yellow. Heron step is about 22 cm (9 inches), almost straight.

The subspecies differ only slightly in size and plumage tone, with the exception of subspecies occidentalis, which as normal colored birds, also has a separate white phase, known as the Grand White Heron (not to be confused with the Great Egret, for "Great White Heron" was once a common name). intermediate between Birds normal and white morph morph are known as Heron Wurdemann, these birds look like a blue "normal" Excellent bald. The Great Blue Heron is found throughout most of North America, as far north as Alaska and the southern provinces of Canada. The range extends south through Florida, Mexico and the Caribbean South America. Birds east of the Rocky Mountains in the northern part of their range are migratory and winter in northern Central America and South America.

The Great Blue Heron can be adapted to almost any wetland habitat in its range. Great Blue Heron rarely venture away from streams, but sometimes seen flying over mountainous areas. This species usually breeds in colonies in trees close to lakes or other wetlands. Often, these colonies are only great blue herons, sometimes with other species of herons nest. These groups are called colonies (a more precise term "colony"). The size of these colonies can be large, between 5-500 nests per colony, with an average of approximately 160 nests per colony. Great Blue Herons build a bulky stick nest, and the female lays 3-6 eggs blue. Repeated human intrusion into nesting areas often results in nest failure, with abandonment of eggs or chicks. Both parents feed the young in the nest by regurgitating food. Predators of eggs and chicks are vultures, hawks and crows, raccoons, bears different, the latter two also potential predators of adults.
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