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

Barry Mansell / Evening bat (Nycticeius humeralis) in flight with mouth open, North Florida, USA

Chien Lee / Wrinkle-lipped Free-tailed Bat (Chaerephon plicatus) group leaving for their evening feeding, Gunung Mulu National Park, Sarawak, Malaysia

Michael Durham / Evening Bat (Nycticeius humeralis) flying at night, Stephen F. Austin Experimental Forest, Texas

Rolf Nussbaumer / Evening Bat {Nycticeius humeralis} flying at night from nest hole in tree, Rio Grande Valley, Texas, USA

Dietmar Nill / Long eared bat {Plecotus auritus} flying over Evening primrose flowers. Germany

Barry Mansell / Evening bat {Nycticieus humeralis} Florida, USA, North America

Toby Sinclair / Indian flying foxes flying at dusk {Pteropus giganteus} Tissamanarama Sri Lanka

Joel Sartore / Photo Ark / Evening bat (Nycticeius humeralis) crawling at private collection in Oklahoma, USA. Captivity.

Joel Sartore / Photo Ark / Female Evening bat (Nycticeius humeralis) crawling at WildCare Foundation, Oklahoma, USA. Captivity.

Joel Sartore / Photo Ark / Female Evening bat (Nycticeius humeralis) at WildCare Foundation, Oklahoma, USA. Captivity.

Joel Sartore / Photo Ark / Two Evening bats (Nycticeius humeralis) looking around at private collection in Oklahoma, USA. Captivity.

Bruce Thomson / Orange leaf-nosed bat (Rhinonicteris aurantia) flying out of abandoned mine in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Orange leaf-nosed bat (Rhinonicteris aurantia) flying out of abandoned mine in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Ghost bat (Macroderma gigas) flying out of a mine addit in late evening, Pine Creek, Northern Territory, Australia.

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) colony flying out from an abandoned mine in late evening. Their orange colouring is due to bleaching from the intense ammonia atmosphere in the mine, Ir...

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) colony flying out from an abandoned mine in late evening. Their orange colouring is due to bleaching from the intense ammonia atmosphere in the mine, Ir...

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) flying out from an abandoned mine in late evening. Their orange colouring is due to bleaching from the intense ammonia atmosphere in the mine, Iron Ran...

Bruce Thomson / Eastern horseshoe bat (Rhinolophus megaphyllus) flying out from an abandoned mine in late evening. Its orange colouring is due to bleaching from the intense ammonia atmosphere in the mine, Iron Range,...