Robert Valentic / Lesuer's Tree Frog (Litoria lesuerii) female from the Lerderderg River near Bacchus Marsh in western Victoria, Australia.

David Perpinan / Western marsh frog (Pelophylax perezi) in a pond, Cuenca, Castile-La Mancha, Spain, August.

Jean E. Roche / European pond turtle (Emys orbicularis) feeding on tadpole of Mediterranean tree frog (Rana meridionalis) Camargue, France. June.

Jean E. Roche / Pond turtle (Emys orbicularis) feeding on European tree frog (Rana meridionalis) tadpole Camargue, France, June.

Adrian Davies / Perez's Frog (Pelophylax perezi) on water lily pad, Madeira.

Cyril Ruoso / Marsh frog (Pelophylax / Rana ridibundus) breeding season interaction between males. Burgundy, France, May.

Chris Mattison / Iberian water / Perez's frog (Pelophylax perezi) Algave, Portugal.

Chris Mattison / Iberian water / Perez's frog (Pelophylax perezi) Algave, Portugal.

Alex Hyde / Frog Orchid (Coeloglossum viride) Nordtirol, Austrian Alps. July.

Alex Hyde / Frog Orchid (Coeloglossum viride) photographed against a white background in mobile field studio. Nordtirol, Austrian Alps. July.

MYN / Paul van Hoof / Iberian waterfrog (Pelophylax perezi) male, La Palma, Canary Islands, March. Meetyourneighbours.net project

MYN / Paul van Hoof / Iberian waterfrog (Pelophylax perezi) male, La Palma, Canary Islands, March. Meetyourneighbours.net project

David Kjaer / Frog orchid (Coeloglossum viride), Wiltshire, UK, June.

Chris Mattison / Marsh frog (Pelophylax ridibunda) Rainham Marshes, Essex, USA, April.

Colin Varndell / Marsh frog (Pelophylax ridibundus), adult male. Cogden, Dorset, UK July.

Colin Varndell / Adult male Marsh frog (Pelophylax ridibundus) Cogden, Dorset, UK, July.

MYN / Goncalo Nuno Lemos / Green frog (Pelophylax perezi) split level shot, Portugal, July. Meetyourneighbours.net project

Juan Manuel Borrero / Illustration of Perez's Frog (Pelophylax perezi). Pencil and watercolor painting.

Wild Wonders of Europe / Muñoz / Western marsh frog (Pelophylax perezi) barely visible at surface of pond, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanca, Castilla y Leon, Spain

Wild Wonders of Europe / Muñoz / Western marsh frog (Pelophylax perezi) barely visible at surface of pond, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanca, Castilla y Leon, Spain

Wild Wonders of Europe / Muñoz / Western marsh frog (Pelophylax perezi) barely visible on pond surface, Campanarios de Azaba Biological Reserve, a rewilding Europe area, Salamanca, Castilla y Leon, Spain

Oriol Alamany / Iberian Green / Western Marsh Frog (Rana perezi) in pond with Common / Lesser Duckweed (Lemna minor), Ebro Delta Natural Park, Catalonia, Spain, September, Captive

John Cancalosi / Iberian green / Western marsh frogs (Rana perzi) mating pair in amplexus, Spain

Robin Chittenden / Western marsh frog {Rana perezi} Spain

John Cancalosi / Western marsh frog pair amplexus {Rana perezi} Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi), close-up of webbed foot of back leg, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi), close-up of nuptial pad on foot of front leg, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi) swimming, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi) on grass, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi) sitting on rock, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi) on its back showing underside, Spain

Jose Luis GOMEZ de FRANCISCO / Western marsh frog (Rana perezi) on rock, Spain

Colin Varndell / Marsh frog (Pelophylax ridibundus) resting. Bexington, Dorset, UK, May.

Steve Nicholls / Frog orchid (Dactylorhiza viride) growing on the machair at Horgabost, South Harris, Outer Hebrides, Scotland, UK, July.

Steve Nicholls / Frog orchid (Dactylorhiza viride) growing on the machair at Horgabost, South Harris, Outer Hebrides, Scotland, UK, July.

Steve Nicholls / Frog orchid (Dactylorhiza viride) growing on the machair at Horgabost, South Harris, Outer Hebrides, Scotland, UK, July.