White-throated mountaingem

The white-throated mountaingem is treated as a species by the International Ornithological Committee (IOC) and BirdLife International's Handbook of the Birds of the World (HBW). However, the North American Classification Committee of the American Ornithological Society and the Clements taxonomy treat it and the grey-tailed mountaingem (Lampornis cinereicauda) as subspecies of what they call the white-throated mountain-gem.[3][4][6][7]

Male

Female

The grey-tailed mountaingem is about 12 cm (4.7 in) long and weighs about 5 to 6 g (0.18 to 0.21 oz). It has a medium-length straight black bill, dark cheeks, and a white stripe behind the eye. Males have mostly dark bronzy green upperparts with an emerald green crown and a black to bluish black tail. Their chin and throat are white, the sides of the neck and upper breast bright green, and the lower breast and vent area dark gray. Females have entirely bright green upperparts. Their central tail feathers are dark metallic to bronze green and the outer ones paler. Their throat and belly are dark rufous and the undertail coverts are gray with white or buff edges.[8]

The white-throated mountaingem is found only in the mountains of western Panama's Chiriquí Province. It inhabits the interior, edges, and shrubby clearings of oak forest and also gardens in communities near the forest. In elevation it ranges from 1,500 m (4,900 ft) up to timberline.[8]

The IUCN has assessed the white-throated mountaingem as being of Least Concern, though it has a small range and its population size and trend are unknown.[1] It is considered common. However, "this hummingbird is potentially threatened by human activities" such as deforestation for timber and agriculture.[8]

• Stiles, F. Gary & Skutch, Alexander F. (1990): A guide to the birds of Costa Rica. Cornell University Press. ISBN 0-8014-9600-4