A member of the taxonomically confusing genus Chlorostilbon, Cozumel Emerald is found only on Isla Cozumel off the coast of Mexico. Cozumel Emerald now is recognized as a species, but for much of the 20th century it was classified as a subspecies of Chlorostilbon canivetii (Canivet's Emerald). This small hummingbird inhabits brushy and scrubby woodlands or second growth, and forages in the lower and middle strata for nectar or insects. Both males and females have forked tails, but that of the male is much longer. Males are mostly emerald in coloration, while females are emerald above and gray below. The call of Cozumel Emerald is a dry chatter.