Bernard Castelein / Proboscis Bat (Rhynchonycteris naso), Madidi NP, Bolovia

Bernard Castelein / Proboscis Bat (Rhynchonycteris naso), Madidi NP, Bolovia

David Pattyn / Sac-winged Bat (Saccopteryx sp) group camouflaged on branch while roosting, , Cuyabeno wildlife reserve, Sucumbios, Amazon rainforest, Ecuador, July

Piotr Naskrecki / Mauritian tomb bat (Taphozous mauritianus) in flight, Chironde, Sofala, Mozambique. Controlled conditions

Piotr Naskrecki / Mauritian tomb bat (Taphozous mauritianus) Chironde, Sofala, Mozambique. Controlled conditions

Emanuele Biggi / Proboscis bats (Rhynchonycteris naso) camougflaged under branch, Peru.

Bernard Castelein / Proboscis bat (Rhynchonycteris naso) on tree, Madidi National Park, Bolivia

Bernard Castelein / Proboscis Bat (Rhynchonycteris naso) group roosting on tree, Madidi National Park, Bolivia

Bernard Castelein / Proboscis Bat (Rhynchonycteris naso) Madidi National Park, Bolivia

Bernard Castelein / Proboscis bat (Rhynchonycteris naso) roosting on tree trunk, Madidi National Park, Bolivia

Bernard Castelein / Proboscis bat (Rhynchonycteris naso) roosting on tree trunk, Madidi National Park, Bolivia

Jiri Lochman / Common sheath-tailed bat (Taphozous georgianus), Cape Range National Park, Ningaloo Coast UNESCO Natural World Heritage Site, Western Australia.

Murray Cooper / Sac-winged Bat (Saccopteryx sp) group camouflaged on branch while roosting, Amazon, Ecuador

Murray Cooper / Sac-winged Bat (Saccopteryx sp) group camouflaged on branch while roosting, Amazon, Ecuador

Hanne & Jens Eriksen / Egyptian tomb bat (Taphozous perforatus) roosting, Oman, November

Nick Hawkins / Proboscis bats (Rhynchonycteris naso) day roosting, Costa Rica, March 2014.

Nick Hawkins / Proboscis bats (Rhynchonycteris naso) day roosting, Costa Rica, March 2014.

Roland Seitre / Black-bearded tomb bat (Taphozous melanopogon) two hanging from ceiling in Prasat Preah Kahn temple, Angkor complex, Siem Reap, Cambodia.

Roland Seitre / Black-bearded tomb bat (Taphozous melanopogon) hanging upside down, Siem Reap, Angkor Vat, Cambodia.

Roland Seitre / Theobold's bat (Taphozous theobaldi) colony roosting in walls in temple, Siem Reap, Angkor Vat, Cambodia.

Pete Oxford / Long-nosed Bats (Rhynchonycteris naso) roosting, Yasuni National Park, Amazon Rainforest, Ecuador, South America.

Luiz Claudio Marigo / Long-nosed Bats (Rhynchonycteris naso) resting on a tree,Tres Irmaos River, Pantanal, Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Long-nosed Bats (Rhynchonycteris naso) resting on tree, Tres Irmaos River, Pantanal, Mato Grosso, Mato Grosso State, Western Brazil.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Roland Seitre / Yellow-bellied Sheathtailed Bat (Saccolaimus flaviventris) portrait, captive at Tolga Bat Hospital, Atherton, Queensland, Australia.

Pete Oxford / Greater Sac-winged Bat (Saccopteryx bilineata) trio roosting, Yasuni National Park, Amazon Rainforest, Ecuador

Claudio Contreras / Gray Sac-winged Bat (Balantiopteryx plicata). Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, June.

Claudio Contreras / Gray Sac-winged Bat (Balantiopteryx plicata) clinging to rock. Maria Madre Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, September.

Christian Ziegler / Greater Sac-winged Bat (Saccopteryx bilineata) detail of sac on wing which is used to attract females and mark territory, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Christian Ziegler / Greater Sac-winged Bat (Saccopteryx bilineata) detail of sac on wing which is used to attract females and mark territory, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Solvin Zankl / Greater white lined / Sac-winged Bat (Saccopteryx bilineata) La Selva Biological Station, Costa Rica

Murray Cooper / Greater Sac-winged Bat (Saccopteryx bilineata) group roosting on tree, Amazon, Ecuador

Claudio Contreras / Lesser doglike sac-winged bat (Peropteryx macrotis) roosting, Uxmal, Yucatan Peninsula, Mexico, January

James Christensen / Chestnut Sac-winged Bat (Cormura brevirostris) roosting in limestone cave, Colon, Panama

Piotr Naskrecki / Greater Sac-winged Bat (Saccopteryx bilineata) roosting, La Selva Biological Reserve, Costa Rica

Piotr Naskrecki / Greater Sac-winged Bat (Saccopteryx bilineata) roosting, La Selva Biological Reserve, Costa Rica

Emanuele Biggi / Mauritian tomb bat (Taphozous mauritianus) resting on tree trunk, poking its tongue out, licking its face, Klaserie Reserve, South Africa.

Roland Seitre / African sheath-tailed bat (Coleura afra) colony roosting, Bankouale, Republic of Djibouti, Africa

Roland Seitre / Two African sheath-tailed bats (Coleura afra) roosting on rock, Bankouale, Republic of Djibouti.

Roland Seitre / African sheath-tailed bat (Coleura afra) colony roosting in cave, Bankouale, Republic of Djibouti.

Roland Seitre / African sheath-tailed bat (Coleura afra) colony roosting in cave, Bankouale, Republic of Djibouti.

Roland Seitre / African sheath-tailed bat (Coleura afra) colony roosting in cave, Bankouale, Republic of Djibouti.

Roland Seitre / African sheath-tailed bat (Coleura afra) roosting in cave, Bankouale, Republic of Djibouti.

Roland Seitre / African sheath-tailed bat (Coleura afra) colony roosting in cave, Bankouale, Republic of Djibouti.

Doug Gimesy / Yellow-bellied sheath-tailed bat (Saccolaimus flaviventris) male, resting on a log, Templestowe, Victoria, Australia. Captive. Controlled conditions.

Doug Gimesy / Underside view of right wing of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, showing thumb. Melbourne, Victoria, Australia. August. Captive, ta...

Doug Gimesy / Underside view of right wing of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, showing thumb. Melbourne, Victoria, Australia. August. Captive, ta...

Doug Gimesy / Underside view of neck and head of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, showing throat pouch. Melbourne, Victoria, Australia. August....

Doug Gimesy / Underside view of neck and head of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, showing throat pouch. Melbourne, Victoria, Australia. August. C...

Doug Gimesy / Rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, on log. Melbourne, Victoria, Australia. August. Captive, taken with permission and under supervisi...

Doug Gimesy / Portrait of rescued male Yellow-bellied sheathtail bat (Saccolaimus flaviventris), approximately aged 18 months. Melbourne, Victoria, Australia. August. Captive, taken with permission and under superv...

Doug Gimesy / Underside view of left foot and leg of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months. Melbourne, Victoria, Australia. August. Captive, taken with...

Doug Gimesy / Tail of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months. Melbourne, Victoria, Australia. August. Captive, taken with permission and under supervisi...

Doug Gimesy / Underside view of lower body of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months, showing legs and tail. Melbourne, Victoria, Australia. August. Cap...

Doug Gimesy / Front view of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months. Melbourne, Victoria, Australia. August. Captive, taken with permission and under sup...

Doug Gimesy / Dorsal view of rescued male Yellow-bellied sheath-tail bat (Saccolaimus flaviventris), approximately aged 18 months. Melbourne, Victoria, Australia. August. Captive, taken with permission and under su...

Roland Seitre / Mauritian tomb bat (Taphozous mauritianus) on a cave wall, W National Park, Sahel, Niger.

Joel Sartore / Photo Ark / Yellow-bellied sheath-tail bat (Saccolaimus flaviventris) crawling at Australian Bat Clinic. Captivity. Important pollinators and seed dispersers, in decline due to entanglement in fruit netting.

Joel Sartore / Photo Ark / Close up of Yellow-bellied sheath-tail bat (Saccolaimus flaviventris) face, at Australian Bat Clinic. Captivity. Important pollinators and seed dispersers, in decline due to entanglement in fruit ne...

Christian Ziegler / Greater Sac-winged Bat (Saccopteryx bilineata) detail of sac on wing which is used to attract females and mark territory, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Christian Ziegler / Greater Sac-winged Bat (Saccopteryx bilineata) group roosting, Smithsonian Tropical Research Station, Barro Colorado Island, Panama

Christian Ziegler / Greater Sac-winged Bat (Saccopteryx bilineata) wing pouch at night, Barro Colorado Island, Panama

Bruce Thomson / Greater white-lined bat (Saccopteryx bilineata) resting on a tree branch, Manaus, Brazil.

Bruce Thomson / Greater white-lined bat (Saccopteryx bilineata) hanging from a tree branch, Manaus, Brazil.

Bruce Thomson / Proboscis bat (Rhynchonycteris naso) resting on a tree trunk, Pantanal, Matto Grosso, Brazil.

Bruce Thomson / Proboscis bat (Rhynchonycteris naso) resting on a tree trunk, Pantanal, Matto Grosso, Brazil.

Bruce Thomson / Troughton's sheathtail bat (Taphozous troughtoni) roosting in cave during the day, Cape Hillsborough, Queensland, Australia.

Bruce Thomson / Common sheathtail bat (Taphozous georgianus) clinging on to rock wall, Kununurra, Western Australia.

Bruce Thomson / Hill's sheathtail bat (Taphozous hilli) upside down, holding on to rock face, Tennant Creek, Northern Territory, Australia.

Bruce Thomson / Three Hill's sheathtail bat (Taphozous hilli) looking out from their hiding place in a rock crevice, 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 / Hill's sheathtail bat (Taphozous hilli) flying out of an abandoned mine in late evening, Tennant Creek, Northern Territory, Australia

Bruce Thomson / Coastal sheathtail bat (Taphozous australis) on rock wall, Captain Billy's Landing, Queensland, Australia.

Bruce Thomson / Bare-rumped sheathtail bat (Saccolaimus saccolaimus) gripping on to tree trunk, Darwin, Northern Territory, Australia.

Karine Aigner / Long-nosed bats(Rhynchonycteris naso) on a branch above the river in Yasuni National Park, Napo Wildlife Center lodge area, Ecuador

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), roosting on wall of 6th AD century old Shiv temple. Badami, Karanataka, India

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), flying out of Garbhgriha stone carved door of 6th century AD old Shiv temple. Badami , Karanataka, India. Stone carving of Lord Shive and Parvati riding...

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), flying out of Garbhgriha stone carved door of 6th century AD old Shiv temple. Badami , Karanataka, India

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), flying out of Garbhgriha stone carved door of 6th century AD old Shiv temple. Badami , Karanataka, India

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), in 6th century AD old Shiv temple. Badami , Karanataka, India

Yashpal Rathore / Naked-rumped tomb bats (Taphazhopus theobaldi), roosting on wall of 6th AD century old Shiv temple. Badami , Karanataka, India

Naskrecki & Guyton / Mauritian tomb bat (Taphozous mauritianus) in flight, Chironde, Sofala, Mozambique. Controlled conditions

Naskrecki & Guyton / Mauritian tomb bat (Taphozous mauritianus) on cave wall, Chironde, Sofala, Mozambique.

Robert Pickett / White-Lined Sac-Winged Bat (Saccopteryx bilineata) on tree trunk, Iquitos, Peru