Wednesday 23 February 2011

Parrot



Parrot common name for members of the order Psittaciformes, comprising 315 species of colorful birds, pantropical in distribution, including the paraket . Parrots have large heads and short necks, strong feet with two toes in front and two in back (facilitating climbing and grasping), and strong, thick bills, with the larger hooked upper mandible hinged to the bones of the head. They are arboreal, feeding on seeds and fruits—except the kea ( Nestor notabilis ) of New Zealand, which is a scavenger in winter. Although they belong to a different order, parrots have certain affinities to pigeons and cuckoos; like them, they feed their young by regurgitation, and they have swellings (ceres) at the base of the nostrils. Usually their voices are harsh, but the thick, fleshy tongue and special voice apparatus permit a wide range of articulations, and some species can be taught to.
The parrots are a broad order of more than 350 birds. Macaws, Amazons, lorikeets, lovebirds, cockatoos and many others are all considered parrots.
Though there is great diversity among these birds, there are similarities as well. All parrots have curved beaks and all are zygodactyls, meaning they have four toes on each foot, two pointing forward and two projecting backward. Most parrots eat fruit, flowers, buds, nuts, seeds, and some small creatures such as insects.
Parrots are found in warm climates all over most of the world. The greatest diversities exist in Australasia, Central America, and South America.

Many parrots are kept as pets, especially macaws, Amazon parrots, cockatiels, parakeets, and cockatoos. These birds have been popular companions throughout history because they are intelligent, charismatic, colorful, and musical. Some birds can imitate many nonavian sounds, including human speech. The male African gray parrot (Psittacus erithacus) is the most accomplished user of human speech in the animal world; this rain forest-dweller is an uncanny mimic.
Currently the Convention on International Trade in Endangered Species (CITES) bans the sale of any wild-caught species, yet the parrots' popularity continues to drive illegal trade.
Some parrot species are highly endangered. In other cases, once tame birds have reproduced in the wild and established thriving feral populations in foreign ecosystems. The monk (green) parakeet, for example, now lives in several U.S. states.

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