Rainbow-bearded thornbill

The rainbow-bearded thornbill was formally described in 1846 by the French ornithologists Adolphe Delattre and Jules Bourcier from specimens collected near the town of Pasto in southwest Colombia. They coined the binomial name Trochilus herrani. This bird is now one of five species placed in the genus Chalcostigma that was introduced in 1854 by the German naturalist Ludwig Reichenbach. The genus name derives from the Greek khalkos ″bronze″ and stigma ″mark″. The specific epithet herrani was chosen to honor the Colombian general and statesman Pedro Alcántara Herrán. Two subspecies are recognised: • C. h. tolimae Kleinschmidt, O, 1927 • C. h. herrani (Delattre & Bourcier, 1846) ==Description==

The rainbow-bearded thornbill is long. Males weigh about and females . Both sexes have a short, needle-like bill. Adult males of the nominate subspecies are mostly bottle green with a white dot behind the eye and rufous forecrown and crown. It has black primaries, a coppery rump, and white undertail coverts. The forked tail is blue-black with prominent white tips at the corners that are most easily seen from below. Its gorget ("beard") is a rainbow of colors from celadon-green through turquoise to yellow and red at the lower end. The feet are black. Adult females are generally similar to males, but with pale yellowish-ochre from lower the belly to the undertail coverts and a much reduced gorget. Juvenile birds are similar to the adult female, but the male has an entirely dark throat. Subspecies C. h. tolimae is very similar to the nominate but is darker overall and its gorget is longer. ==Distribution and habitat==

The nominate subspecies of rainbow-bearded thornbill is found from the Western Andes of Colombia in Cauca Department through Ecuador on both slopes of the Andes into northern Peru's departments of Piura and Cajamarca. C. h. tolimae is restricted to Nevado del Tolima in Colombia's Central Andes. A bird of high elevations, it is typically found between in Colombia and in Ecuador. Its primary habitat is paramo, open country with bushy patches and small woodlands, and gulleys with thickets of ferns and bromeliads. ==Behavior==

Movement The rainbow-bearded thornbill is resident throughout its range. Breeding The rainbow-bearded thornbill's breeding phenology is not well documented. Its breeding season appears to include at least July to September. The nest has not been described. One nest with three eggs has been reported, departing from the almost invariable two-egg clutch of hummingbirds. Vocalization There are few recordings of the rainbow-bearded thornbill's vocalizations. What might be a song is a "repeated low-pitched cheet-dee-dee-cheet". ==Status==

The IUCN has assessed the rainbow-bearded thornbill as being of Least Concern. It has a large range but its population size is unknown and believed to be decreasing. No specific threats have been identified. It is usually described as rare to locally common. ==References==