File:Scintillant Hummingbird (female) (8052508800).jpg

Interesting Fact The male weighs 2 g and the female 2.3 g. This is one of the smallest birds in existence, marginally larger than the Bee Hummingbird. <a href="http://en.wikipedia.org/wiki/Scintillant_Hummingbird" rel="nofollow">says wikipedia</a>

Details The Scintillant Hummingbird (Selasphorus scintilla Gould) is among the smallest of hummingbirds, and is the smallest within its range of the Pacific slope of Costa Rica and western Panama. Despite its diminutive size, it is a striking bird that is difficult to overlook, or to forget once seen.

Identification A tiny hummingbird. In good light the Scintillant is unmistakable, though if glimpsed without a size reference, it could be mistaken for several other hummingbirds. The adult male has a large irridescent orange gorget that can appear yellow, redish, or black at different viewing angles. The gorget includes prominent ‘tails’ that project laterally from the lower corners, and the wings produce a distinctive trill during flight. The bill is relatively short, slightly shorter than the head. The back is green and grades into a light rufous on the sides and belly.

The rufous tinge is important for identification: the female and immature birds, which lack the gorget or wing trill, can be identified by the combination of tiny size, a short bill, and rufous-tinged plumage.