Cozumel Emerald
Cynanthus forficatus
Male Cozumel emeralds are 9 to 10.5 cm (3.5 to 4.1 in) long and females 8 to 9.1 cm (3.1 to 3.6 in). Males and females both weigh about 2.5 g (0.088 oz). Males have a black bill with a red tip. Its crown is bright golden to golden green and the rest of the upperparts are a slightly duller golden green. Its underparts are brilliant metallic golden green with white tibial tufts. The tail is long and deeply forked, blue-black or black with a blue gloss, and the central two or three pairs of feathers have dark brownish gray tips. The female's maxilla is black and the mandible red with a black tip. Voice: The Cozumel emerald's vocalizations are described as similar to those of it close relatives, "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: Cozumel Emerald and Turquoise-crowned Hummingbird.