The tiny disc-winged bats found in the tropical rain forests of Central and South America roost in a ‘head up’ position rather than the usual upside-down pose adopted by other bats. They can do this because they have a suction cup on each foot and on each thumb. Disc-winged bats select the tube-like unopened leaves of wild banana plants and crawl inside. They hold onto the leaf's smooth surface with their suction cups. But since the leaves unfurl in a few days, leaving them unprotected, the entire roost consisting of around 6-7 bats moves to a new leaf.
Even one of the discs is strong enough to support the bat's entire weight.