A medium sized bronze and green hummingbird. The male has a bluish-green throat and chest, a white belly, and a forked tail. The crown and upper parts are green, with a bronze tinge to the rump and tail. The bill is dark with a reddish lower mandible. The female is similar with mainly white underparts and small green spots on the throat and sides.
In the field the Mangrove Hummingbird Amazilia boucardi most resembles the Charming Hummingbird Amazilia decora. The bill of A. decora is straighter than is the bill of A. boucardi, and the throat and chest patterns of the two species are different. The chest of A. decora is violet-blue, and the throat is greenish, whereas A. boucardi has a bluish-green chest and throat (Garrigues and Dean 2007). The female Mangrove Hummingbird A. boucardi also resembles the female White-bellied Emerald Amazilia candida, but A. boucardi has a mostly dark tail with bronze-green cental rectrices, whereas the female A. candida has a blacker tail and a greener chest (Ridgley and Gwynne 1989).
Male and female Amazilia boucardi also resemble the Snowy-bellied Hummingbird Amazilia edward, which has an adjacent but not overlapping range. The males of both species are mostly glittering green with a white belly. In the male Snowy-bellied Hummingbird, however, the contrast between the green throat and the white belly is "cleaner." A. Edward males have a clearer contrast in their underparts. The tail color is bronzy green in A. boucardi but black in A. edward, and the rump of A. edward is concolor with the rest of the upperparts, instead of coppery bronze as on A. boucardi (Ridgley and Tudor 1989). They also differ in the vent plumage color, which is whitish in A. boucardi and rufous in A. edwardi (Garrigues and Dean 2007). In addition, the bill of A. boucardi is slightly larger than is the bill of A. edward.
Male has an essentially straight but slightly decurved, medium-sized bill. The upper mandible is blackish, the lower mandible is reddish, and distally dusky grey. The upper body parts and flanks are golden to bronze-green. The throat and breast are a glittering bluish-green. The feathers toward the chin have prominent white subterminal bars. The belly is whitish with bronze-green sides and the undertail-coverts are also white. The tail is bronzy-green and slightly forked, with almost blackish lateral and terminal portions on the outer rectrices. The female is similar to the male but mostly white below with a little green spotting on the throat and the sides, and the female’s outermost rectrices have grayish tips. The female has a distinct green malar pattern offset by white below the eye, lore, and cheek. Immature males resemble the female in throat coloration, and have more grayish below than the adults (Garrigues and Dean 2007, Ridgley and Gwynne 1989).
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body length: 9.5-11 cm
mass: 4.5 grams
bill length: 18 mm