Plain-bellied Emerald

The plain-bellied emerald is 9 to 10 cm (3.5 to 3.9 in) long. Males weigh 4 to 4.5 g (0.14 to 0.16 oz) and females about 4.3 g (0.15 oz). Adults have a short, straight to slightly decurved, blackish bill with a red base to the mandible. Adult males of the nominate subspecies C. l. leucogaster have a glittering green crown and sides of the neck. The rest of its upperparts, flanks, and sides of the throat are golden- to bronze-green. The center of its throat and underparts are white. Its inner tail feathers are bronze-green to bronze and the outer ones bluish black. Voice: What is thought to be the plain-bellied emerald's song is "a long series of repeated single 'pseeee' notes". It also makes calls described as "a thin 'tsink' and a high-pitched stuttering series".