Colin Varndell / Marsh frog (Rana ridibunda / Pelophylax ridibundus) in breeding season, Dorset, UK, May

Michael D. Kern / Waxy monkey tree frog (Phyllomedusa sauvagii) captive, from Central and South America

Michael D. Kern / Vietnamese Mossy Frog (Theloderma corticale) three camouflaged against moss, captive, from Vietnam

Sandra Bartocha / Moor Frog (Rana arvalis) Mecklenburg-Vorpommern, Germany, April

Sandra Bartocha / Moor Frog (Rana arvalis) males, in breeding coloration, Germany, April

Chris Mattison / Harlequin poison dart frog (Oophaga histrionica), captive, occurs in Ecuador

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

Juan Manuel Borrero / Red-eyed Treefrog (Agalychnis callidryas) on red bromeliad flower, captive from South America

Juan Manuel Borrero / Red-eyed Treefrog (Agalychnis callidryas) peering from behind a leaf, captive from South America

Bert Willaert / Trivandrum / Golden Frog (Hylarana aurantiaca) in it's landscape. Western Ghats, India. Vulnerbale species.

Staffan Widstrand / Wild Wonders of China / Gaoligongshan Tree Frog (Polypedates / Rhacophorus gongshanensis) in fern (Cibotium barometz) Gaoligongshan Mountains, Yunnan, China

Bert Willaert / Emerald Forest Frog (Hylorina sylvatica) on moss, Chile, January