Western emerald

The western emerald (Chlorostilbon melanorhynchus) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is found in Colombia and Ecuador.

The western emerald is 10.9 to 11.4 cm (4.3 to 4.5 in) long and weighs about 2.6 g (0.092 oz). Both sexes of both subspecies have a short black bill. The nominate male has an iridescent green forehead and crown with gold highlights, a bright green face, shining bronzy green upperparts, and a steel blue tail. Its underparts are glittering emerald green, with greater iridescence and a blue tinge on the breast. It has white thigh tufts. The female has a bronzy green forehead and crown and a blackish face with a pale gray spot behind the eye. The rest of its upperparts are metallic grass green and the tail is blue-black with white tips. Its underparts are pale gray to white with a buffy tone on the throat and belly. C. m. pumilus, when treated separately, differs only by having a slightly shorter bill and a brighter crown than the nominate.