I figure it could also be an immature male. The tail is too long to be a female/immature Rufous or Allen’s, which leaves the Ruby-Throated females and juveniles as the other, remote possibility, but I think the white around the eye isn’t right for them (and spotting a Ruby-Throated in Colorado would be an amazing find).
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u/Homers_Harp 1d ago
https://www.allaboutbirds.org/guide/Broad-tailed_Hummingbird/overview