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Mexican Sheartail is a small hummingbird endemic to the northern part of Mexico's Yucatan Peninsula. In its tiny range, the species is uncommon in thorn scrub and open habitats such as roadsides and gardens. The male Mexican Sheartail has an iridescent purplish gorget and a long, slightly decurved bill, with green upperparts, white underparts with green sides and a long, deeply forked tail; the female is duller, mostly green above and white below without the bright gorget of the male.