Trinidad: Blue-chinned Sapphire

Lucky for us that the blue sheen of the Blue-chinned Sapphire is not limited to the chin but rather mixes with the emerald green in an ever-changing and hypnotic melange of color. The male is shown here, in 3 poses on the same perch.

The female is described as having white-tipped green feathers on her underparts. The Blue-chinned Sapphire is fairly common on Trinidad, less so on Tobago, and  ranges well south to Brazil and Peru. Note the straight bill with the reddish lower mandible, and white thighs. The tail is "steel blue" (ffrench, Birds of Trinidad and Tobago). A previous common name for this species was Blue-breasted Sapphire.

You may want to skip the somewhat confusing taxonomy that follows.

The IOC World Bird List places the Blue-chinned Sapphire in the genus Chlorestes, as does ffrench, so we'll go with that convention. Others treat it as a member of the genus Chlorostilbon, which contains about 18 species with the word "Emerald" in the common name. Clements (2007) had it in genus Chlorostilbon, fwiw, but has since moved it back to the monotypic Chlorestes. The current Clement's Checklist is at (http://www.birds.cornell.edu/clementschecklist/downloadable-clements-checklist) and contains a full list of 10,000+ bird species and numerous subspecies, and where they are found.

The IOC, btw, is the International Ornithological Committee, aka IOU.