Sven Zacek / American mink (Mustela vison) running on ice with Common frog (Rana temporaria) prey, Tartumaa, Estonia, January. Introduced species.

Cyril Ruoso / African clawed frog (Xenopus laevis) introduced accidentally in France, man holding net of captured frogs, part of action plan to fight this alien species, France

Cyril Ruoso / African clawed frog (Xenopus laevis) introduced accidentally in France; man holding specimen of caught frog whilst other searches for more in net, part of action plan to fight this alien species, Fran...

Sven Zacek / Otter (Lutra lutra) feeding on wintering Common frog (Rana temporaria) Southern Estonia, January.

Bert Willaert / Researcher holding a Titicaca water / Lake Titicaca frog (Telmatobius culeus) underwater, Lake Titicaca, Bolivia, October, Critically endangered.

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) breaking from skin after rain, Australia

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) breaking from skin after rain, Australia

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) underground in skin before rain, Australia

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) breaking from skin underground after the start of rain, central Australia

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) eating skin before digging out, central Australia

D. Parer & E. Parer-Cook / Water-holding Frog (Cyclorana platycephala) underground in skin before rain, central Australia

Robert Valentic / Desert water holding frog {Cyclorana platycephala} female surfaces after heavy rains and moves to a temporary pool to find a mate, Mungindi, New South Wales, Australia

Robert Valentic / Male Woodland water holding frog {Cyclorana verrucosus} NSW, Australia

Michael & Patricia Fogden / Main's Water-holding Frog (Cyclorana maini) portrait, side view, King's Canyon, Watarrka National Park, Northern Territory, Australia

Michael & Patricia Fogden / Main's Water-holding Frog (Cyclorana maini) in water, King's Canyon, Watarrka National Park Northern Territory Australia

Michael & Patricia Fogden / Giant Water-holding Frog (Cyclorana novaehollandiae), Queensland, Australia

Grant Maslowski / Fringe-lipped bat (Trachops cirrhosus) male, catching Tungara frog (Engystomops pustulosus) prey from pond, within a flight cage of the Smithsonian Bat Lab, Smithsonian Tropical Research Institute, Ga...

Emanuele Biggi / Common toad (Bufo bufo) male holding dead female in amplexus, Viterbo, Italy. Female likely killed by mating ball behaviour.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) wading in shallow river with frog prey in beak, Allahein River, The Gambia.

Nick Upton / Carrion crow (Corvus corone) holding male European toad (Bufo bufo) after pulling it away from a female that it and another male were spawning with, Forest of Dean, Gloucestershire, UK, March.

Doug Gimesy / Field ecologist holding and examining 'metamorph', young frog that recently lost its tadpole tail, of Water holding frog (Cyclorana platycephala) collected from pool of water formed after exceptional...

Doug Gimesy / Tom Hunt, Wild Deserts' field ecologist, holding and examining 'metamorph', young frog that recently lost its tadpole tail, of Water holding frog (Cyclorana platycephala) collected from pool of w...

Bruce Thomson / Water-holding frog (Cyclorana platycephala) in shallow pool after rain, Westmar, Queensland, Australia.