Buff-bellied Hummingbird

The buff-bellied hummingbird is 10 to 11 cm (3.9 to 4.3 in) long and weighs 2.9 to 4.7 g (0.10 to 0.17 oz). Adult males have a rosy reddish bill that is dusky at the end; females' have more dark on the maxilla. Adult males of the nominate subspecies have metallic bronze green upperparts that are duller and darker on the crown. Their uppertail coverts are a mix of bronze green and cinnamon rufous. Their tail feathers are chestnut at the base and metallic bronze at the end. Voice: The buff-bellied hummingbird's vocalizations have been well studied only in Texas. Displaying individuals make a two-syllable "tsi-we" call. During feeding it makes "tik" or "tik-k" notes. When chasing other hummingbirds it gives a "long, low call with notes repeated rapidly (see-see-see-see-su-su)"; this vocalization has also been described as the species' song.