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