It is native to humid evergreen forests in the American tropics. Range extends from extreme south - eastern Mexico to Amazoniain Peru and Brazil, in lowlands up to 500 m (1,640 ft) (at least formerly) up to 1,000 m (3,281 ft). It has been widely extirpated by habitat destruction and capture for the pet trade. Formerly it ranged north to southern Tamaulipas. It can still be found on the island of Coiba. It is also the Honduran national bird.
It is about 81 to 96 cm (32 to 36 inches) long, of which more than half is the pointed, graduated tail typical of all macaws. The average weight is about a kilogram (2 to 2.5 pounds). The plumage is mostly scarlet, but the rump and tail-covert feathers are light blue, the greater upperwing coverts are yellow, the upper sides of the flight feathers of the wings are dark blue as are the ends of the tail feathers, and the undersides of the wing and tail flight feathers are dark red with metallic gold iridescence. Some individuals may have green on the wings near the yellow band. Three subspecies present varying widths in their yellow wing band. There is bare white skin around the eye and from there to the bill. Tiny white feathers are contained on the face patch. The upper mandible is mostly pale horn in color and the lower is black. Sexes are alike; the only difference between ages is that young birds have dark eyes, and adults have light yellow eyes.
Scarlet Macaws make loud, low-pitched, throaty squawks, squeaks and screams designed to carry many miles.
Two Scarlet Macaws at the Henry Doorly Zoo in Omaha, Nebraska.
Before the Scarlet Macaw's decline in population, its distribution included much of Costa Rica. However, by the 1960s Scarlet Macaws had been decreasing in numbers due to a combination of factors, particularly hunting, poaching, and the destruction of habitat through deforestation. Further, the spraying of pesticides by companies cultivating and selling bananas for export played a significant role in decreasing Scarlet Macaw populations.
The combined factors stressed the population of Scarlet Macaws in Costa Rica, where they had previously occupied approximately 42,500 km² of the country's total national territory of 51,100 km², leaving viable populations in the early 1990s isolated to only two regions on the Pacific Coast of Costa Rica; the Carara Biological Reserve and Peninsula de Osa. By 1993 surveys had shown Scarlet macaws occupied only 20% (9,100 km²) of their historic range in Costa Rica.
http://en.wikipedia.org/wiki/Scarlet_macaw