They're probably great stripe-faced bats (Vampyrodes major), which have the broad muzzle as seen in the photo, and roost in small groups of two to four under palm fronds. White-lined fruit bats (Platyrrhinus spp) are similar and likewise roost under palm fronds but usually in larger groups (up to twenty, probably harems). Tent-making bats (Uroderma bilobatum) are similar to both as well but have naked tails (the others have hair-fringed tail membranes) and always roost under the leaves of bananas and heliconias, biting through the leaf along the midrib so that it folds downwards on either side forming a protective tent.
