Rufous HummingbirdSelasphorus rufus
3 1/2-4" (9-10 cm). Male has bright rufous upperparts and flanks and iridescent orange-red throat. Female green above, with rufous tinge on rump and flanks, and much rufous in tail. Adult male Allen's Hummingbird has green crown and back; female and immature Allen's not safely separable from Rufous in field, but have narrower outer tail feathers. Female Ruby-throated and Black-chinned similar, but lack rufous on rump and flanks. See Calliope and Broad-tailed Hummingbirds.