Molossidae

Molossidae, the free-tailed bats, is the fourth-largest bat family with about 110 species as of 2012, distinguished by a tail that extends well beyond the membrane joining it to the hind legs. They are robust bats with long, narrow wings that let them fly up to 60 miles per hour with tailwinds and at altitudes over 10,000 feet, wrinkled lips, and cartilage that lets them stretch or retract the tail membrane for maneuverability comparable to swifts, swallows and martins. Free-tailed bats are found on every continent except Antarctica, typically roosting in caves, abandoned mines or tunnels.