Nick Upton / Daubenton's bat (Myotis daubentinii) hunting at night over a pond formed by a Eurasian beaver (Castor fiber) dam, Devon Wildlife Trust's Devon Beaver Project, Devon, UK, April.

Dietmar Nill / Daubenton's bat, (Myotis daubentonii) catching prey from the surface of a pond, Germany, captive.

Dietmar Nill / Daubenton's bat, (Myotis daubentonii) flying over water searching for prey, Germany, captive.

Dietmar Nill / Daubenton's bat, (Myotis daubentonii) catching prey from the surface of a pond, Germany, captive.

Dietmar Nill / Daubenton's bat, (Myotis daubentonii) catching prey from the surface of a pond, Germany, captive.

Nick Upton / Daubenton's bat (Myotis daubentonii) held during an autumn swarming survey run by the Wiltshire Bat Group, near Box, Wiltshire, UK, September. Model released.

Nick Upton / Natterer's bat (Myotis nattereri) held with wings spread during an autumn swarming survey run by Wiltshire Bat Group, Box Mine, Wiltshire, UK, September. Model released.

Nick Upton / Laura Hammerton being shown how to identify a Daubenton's bat (Myotis daubentonii) by Dr. Danielle Linton using a key during an autumn swarming survey run by the Wiltshire Bat Group, Box mine, Wiltshi...

Nick Upton / Laura Hammerton using a spring balance to weigh a Daubenton's bat (Myotis daubentonii) during an autumn swarming survey run by Wiltshire Bat Group, Box Mine, Wiltshire, UK, September. Model released.

Nick Upton / Member of the Wiltshire Bat Group identifying Daubenton's bat (Myotis daubentonii) with illustrated key during an autumn swarming survey run by the Wiltshire Bat Group, Box mine, Wiltshire, UK, Septem...

Dietmar Nill / Daubenton's bat (Myotis daubentonii) catching prey from surface of pond and transferring to mouth, captive, Germany, April

Dietmar Nill / Daubentons bat (Myotis daubentonii) catching prey from surface of a pond, captive, Germany, April