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A fairly typical Amazilia hummingbird in shape and structure. In indirect sunlight appears all dark, except for white thighs. Underparts and most of upperparts green. Rump purplish and tail deep blue throughout.
Hybrids with Berylline Hummingbird are reasonably common (only reported within the range of A. c. cyanura), which have some blue and some rufous feathers in the tail.
Very limited distribution with the two subspecies located in two separate areas. A. c. guatemalae is found in a tiny area along the Pacific slope of Guatemala and the southern tip of Oaxaca in Mexico. A. c. cyanura is found in eastern El Salvador, southern Honduras (and a few scattered location further inland) and western Nicaragua.
Two distinct subspecies are described (A. c. guatemalae to the north and west and A. c. cyanura to the south and east), which may be sufficiently different to consider them as different species. However the almost complete lack of knowledge of the biology of both species makes the taxonomic status difficult to determine. A. c. cyanura often hybridizes with the closely related Berylline Hummingbird Amazilia beryllina. Formerly named Saucerottia cyanura.
Three subspecies recognised by Clements (though not by all authorities,:
Humid evergreen forest and edge, coffee plantations.
Tend to be found on fairly low vegetation either deep within forest or at forest edge. Sing from low bushes in open areas at forest edge. Several records from Costa Rica of the southern form A. c. cyanura suggest that it might be partially migratory.
 External Links
A page on this species with photos can be found on http://tomjenner.com/mayanbirding/thebirds_blue_tail_humm.html