The long-tailed sylph is a species of hummingbird found along the outer edges of northern South America (although going quite far inland) from Bolivia to Venezuela.
Males, which I saw, are quite a bit different than females. There are six subspecies. I saw Aglaiocercus kingii emmae, which is found in northwestern Ecuador to southwestern and north central Andes of Colombia and different subspecies have different characteristics. Compared to the nominate subspecies, found in the eastern Andes of Colombian, this subspecies has a slightly longer bill, is a paler and duller green, and has a bright green throat.
I'm impressed that you can identify the subspecies. "Slightly longer bill" and slight color variations seem pretty vague.
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