Molossids: Mastiffs and Freetails
This picture is a shot of the underside of a bridge where Mexican Free-tail (Tadarida brasiliensis mexicana) bats roost. We could hear them chirping but this crevice was too narrow to be able to see them. We could actually make out some Myotis bats in another, wider, crevice. Bats like to roost under bridges because they're open underneath, so it's easy to drop out and fly away. Plus they're usually over water, which means lots of bugs, yum.