The species forms large colonies containing up to a few hundred thousand individuals. It rest in hot caves during the day, where it normally roost in association with, but spatially separated from, bats of other species (Rodriguez-Duran and Lewis 1987, Rodriguez-Duran 1998, Silva-Taboada 1979). This bat begins to leave its roost after dark. It is morphologically specialized for consumption of nectar, also include pollen. In some dry areas, this bat visit columnar cacti that bloom at night. In addition, it also consumes insects and occasionally ingests fruit. Dates on reproduction are scarce, births apparently occur at two different times during the year. On Puerto Rico, pregnant females are known from February through July and again in September and October (Gannon et al. 2005). 
In Puerto Rico, M. redmani used a combination of nectar and insects, in addition, 24% of individuals consumed only nectar, and 12% ate a combination of nectar, fruit, and insects. In terms of frequency of use, nectar dominated the diet of M. redmani, with pollen appearing on the fur of 91% of individuals. Although insects occurred in the feces of 73% of these bats, seeds were detected in only 22% (Soto-Centeno and Kurta 2006).

This species is known from Cuba, Hispaniola, Puerto Rico, Jamaica, and southern Bahamas Islands (Simmons 2005).

Disruption of tropical habitats in the Caribbean islands must be closely surveyed. Found in protected areas.