Wild Wonders of Europe / Lundgren / Pool Frog (Pelophylax lessonae) viewed from below while swimming, underwater around Crisan village, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Pool frog (Pelophylax lessonae) reflected in waters surface at night, Danube Delta, Romania, June.

Wild Wonders of Europe / Widstrand / Pool Frog (Rana lessonae) sitting on White lily pad, Danube delta rewilding area, Romania

Wild Wonders of Europe / della Ferrera / Common european frogs (Pelophylax kl. esculentus) the hybrid of the Pool frog (Pelophylax lessonae) and the Marsh frog (Pelophylax ridibundus) on tree trunk submersed in water, near Muilovcica village...

Morley Read / Brown-banded water snake (Helicops angulatus) swallowing a Basin treefrog (Boana lanciformis) in a pool full of tadpoles in rainforest, Orellana Province, Ecuador. (non-ex)

Morley Read / Brown-banded water snake (Helicops angulatus) swallowing a Basin treefrog (Boana lanciformis) in a pool full of tadpoles in rainforest, Orellana Province, Ecuador. (non-ex)

Nick Upton / Common frog (Rana temporaria) frogspawn in pond created by damming of woodland stream by Eurasian beaver (Castor fiber). Beaver gnawed branch in background. Devon Beaver Project, Devon Wildlife Trust,...

Nick Upton / Common frog (Rana temporaria) frogspawn in pond created by damming of woodland stream by Eurasian beaver (Castor fiber). Beaver gnawed branch in background. Devon Beaver Project, Devon Wildlife Trust,...

Loic Poidevin / Pool frog (Pelophylax lessonae) Green Lake of Neuchatel, Switzerland, September.

Nick Upton / Common European toad toadlet (Bufo bufo) resting on an Oblong-leaved sundew plant (Drosera intermedia) in a dried out marshland pool, Studland heath, Dorset, UK, July.

Emanuele Biggi / Dark-eared treefrog (Polypedates macrotis) on wooden path around its breeding pool, Kubah National Park, Sarawak, Malaysia.

Nick Upton / Common frog (Rana temporaria) tadpoles grazing algae from aquatic plants in a freshwater pond, Wiltshire, England, UK, May.