Thomas's sac-winged bat (Balantiopteryx io ) is a species of sac-winged bat in the family Emballonuridae.
It is the smallest species when compared to others in the genus Balantiopteryx, and lacks the white trim that is characteristic of Balantiopteryx plicata.The males weigh about 3.7 g, while the females weigh about 5 g.
This bat prefers to live in caves near the entrance with some light, but there have been instances where they have been found deeper in the caves where it is darker. It has also been found in railroad tunnels. It likes to stay about nine inches or more away from the others when hanging on the ceiling. Groups of fifty or more of these bats can be found in the colony.It feeds after sunset, so observing the bats is difficult.These bats are insectivores.
There is not much data available for this species’ courting rituals, but what is known is that the female usually has one fetus, and the pregnant females can be found in March, April, May, and June.
