Rolf Nussbaumer / Evening Bat {Nycticeius humeralis} flying at night, Rio Grande Valley, Texas, USA

Rolf Nussbaumer / Evening bat {Nycticieus humeralis} Texas, USA.

John Abbott / Evening bat (Nycticeius humeralis) flying; shots taken with high speed flash San Saba County, Texas, USA. Controlled conditions. July

Mark MacEwen / Brazilian / Mexican free-tailed bats (Tadarida brasiliensis) flying around in Frio Bat cave just before emergence into early evening light, Concan, Texas, USA, July.

Mark MacEwen / Brazilian / Mexican free-tailed bats (Tadarida brasiliensis) flying around in Frio Bat cave just before emergence into early evening light, Concan, Texas, USA, July.

Paul Williams / Bats flying from Deer Cave, Gunung Mulu National Park, Sarawak, Borneo, Malaysia, July.

Michael Durham / Southeastern myotis (Myotis austroriparius) flying out of a hollow tree roost at dusk, Central Texas, March.

Michael Durham / Evening bat (Nycticeius humeralis) perching at night, Central Texas, USA, March.

Michael Durham / Townsend's big-eared bat (Corynorhinus townsendii) flying out of cave at dusk, Derrick Cave complex, Central Oregon, USA, August.

Michael Durham / Evening bat (Nycticeius humeralis) roosting in crack of dead tree, Central Texas, USA, March.

Michael Durham / Evening Bat (Nycticeius humeralis) tucked into the crevice of dead snag for a day roost, central Texas

Michael Durham / Evening Bat (Nycticeius humeralis) roosting at night, central Texas