Golden-crowned Emerald
Cynanthus auriceps
The golden-crowned emerald is 7.5 to 9.5 cm (3.0 to 3.7 in) long and weighs about 2.2 g (0.078 oz). The adult male's crown is brilliant golden green and the rest of its upperparts duller golden green to bronzy green. Its underparts transition from an almost pure green on the chin and throat to brilliant golden green at the vent. The tail is long and deeply forked; its feathers are black with a violet-bluish gloss, and the central three pairs have broad brownish gray tips. The adult female's upperparts are like the male's. Its underparts are light gray that is palest on the belly and vent. Voice: The golden-crowned emerald has "dry, rattling and chattering calls".
ID text from Wikipedia, CC BY-SA 4.0
Turquoise-crowned Hummingbird
Cynanthus doubledayi
The Cornell Lab of Ornithology's Birds of the World does not describe the turquoise-crowned hummingbird separately from the broad-billed hummingbird. Voice: The turquoise-crowned hummingbird's vocalizations have not been separately described from those of the broad-billed hummingbird. That species' song, sung only by males, "egins with short chip note, then a series of similar notes ranging in frequency from 2 to 13 kHz."
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Golden-crowned Emerald and Turquoise-crowned Hummingbird.