Red-billed streamertail

The red-billed streamertail was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Trochilus polytmus. Linnaeus quoted the description in Latin by the Irish physician Patrick Browne in his The Civil and Natural History of Jamaica which had been published two years earlier in 1756. The specific epithet polytmus is from the Ancient Greek polutimos meaning "costly" or "valuable". The International Ornithological Committee (IOC), BirdLife International's Handbook of the Birds of the World, and the Clements taxonomy treat the red-billed streamertail and black-billed streamertail (T. scitulus) as separate species. However, the North American Classification Committee of the American Ornithological Society calls T. polytmus "streamertail" and assign the red-billed and black-billed forms to it as subspecies. The two species (or subspecies) interbreed in their narrow contact zone. The species as defined by the IOC is monotypic: no subspecies are recognised. ==Description==

The male red-billed streamertail is long including the tail streamers and weighs . The female is about long and weighs . The adult male has a coral red bill with a black tip. It has a dull black to blue-black crown; it and the nape form a deep velvety black crest. The rest of its upperparts are bright metallic green. Its tail is black with a green to bronzy green gloss. The next to outermost pair of tail feathers is very long, giving the species its English name. The male's face and most of its underparts are metallic yellowish green; the undertail coverts are blue-black or black with a bluish gloss. The adult female's bill is a duller red than the male's. Its upperparts are metallic bronze green to greenish bronze that is duller on the crown. Its tail lacks the male's streamers. Its central pair of feathers are bright bronze green and the rest black with some bronze green gloss, and the outermost two pairs have wide white tips. Its underparts are white with metallic bronze green spots on the breast and flanks. Immature males are similar to the adult but lack the tail streamers; its tail feathers have bronze green tips. ==Distribution and habitat==

The red-billed streamertail is found throughout Jamaica except in the extreme eastern end, where the black-billed is found. It inhabits evergreen montane forest, lowland tropical forest, and secondary forest. It shuns mangroves and arid highlands. In elevation it ranges from sea level to ; it is considered fairly common in the lowlands and abundant at middle and higher elevations. ==Behavior==

Movement The red-billed streamertail is an elevational migrant. ==Status==

The IUCN has assessed the red-billed streamertail as being of Least Concern. It has a very large range but its population size and trend are not known. No immediate threats have been identified. "The ready occupation of man-made habitats suggests that habitat loss is unlikely to be a problem." ==Gallery==

Red-billed streamertail (Trochilus polytmus) juvenile male.jpg|Juvenile male Red-billed streamertail (Trochilus polytmus) juvenile male feeding 2.jpg|Juvenile male feeding Red-billed streamertail (Trochilus polytmus) feeding.jpg|Adult male feeding Red-billed streamertail (Trochilus polytmus) female in flight 2.JPG|Female in flight ==References==