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Florisuga mellivora
Large and attractive hummingbird that ranges from Mexico south to Peru, Bolivia and south Brazil. The approximately 12 cm long male White-necked Jacobin is unmistakable with its white belly and tail, a white band on the nape and a dark blue hood. Immature males have less white in the tail and a conspicuous rufous patch in the malar region. Females are highly variable, and may resemble adult or immature males, have green upperparts, white belly, white-scaled green or blue throat, and white-scaled dark blue crissum, or be intermediate between the aforementioned plumages, though retain the white-scaled dark blue crissum. Females are potentially confusing, but the pattern on the crissum is distinctive and not shared by superficially similar species.
Great spotting! I would love to invite you to my new mission for Ecuador's birds: http://www.projectnoah.org/missions/4508...
I'm pretty sure it's a Sword billed Hummingbird. Can you confirm the 'sword' is partially in the feeder?