Guy Edwardes / Marsh Frog (Pelophylax ridibundus) vocalising with bokeh effect in the background, Danube Wetlands, Bulgaria

Guy Edwardes / Marsh Frog (Pelophylax ridibundus) vocalising with bokeh effect in the background, Danube Wetlands, Bulgaria

Wild Wonders of Europe / Ziegler / Marsh frog (Rana ridibunda) in water, The Peloponnese, Greece, May 2009

Wild Wonders of Europe / Maitland / Marsh frog (Pelophylax / Rana ridibundus) head above water, Lake Macro Prespa, Stenje region, Galicica National Park, Macedonia, June 2009

Wild Wonders of Europe / Maitland / Marsh frog (Pelophylax / Rana ridibundus) close-up of head, Stenje region, Lake Macro Prespa, Galicica National Park, Macedonia, June 2009

Stephen Dalton / Marsh frog (Rana ridibunda) leaping over water, another in water, controlled conditions, from Europe

Wild Wonders of Europe / Oxford / Marsh frog (Rana ridibunda) calling, Sierra de Andjar Natural Park, Mediterranean woodland of Sierra Morena, north east Jan Province, Andalusia, Spain, April 2009

Wild Wonders of Europe / Oxford / Marsh frog (Rana ridibunda) calling, Sierra de Andjar Natural Park, Mediterranean woodland of Sierra Morena, north east Jan Province, Andalusia, Spain, April 2009

Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) in water, Spain

Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) reflected at water surface, Spain

Adrian Davies / Marsh frog {Rana ridibunda} in pond with water lilies, UK

Robert Valentic / European marsh frog (Pelophylax ridibundus) sub-adult from a small brook, Dadia Forest, NE Greece, July. Controlled conditions.

Melvin Grey / Marsh Frog (Pelophylax ridibundus) adult at edge of small, open lake in public park, hiding amongst 'blanket weed', with small fish. Kresna Area, Bulgaria

Will Watson / Marsh Frog (Pelophylax ridibundus) basking on Bur-reed (Sparganium sp.) leaves, flood-plain pool, Stare Okopy, Poland.

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

Melvin Grey / Marsh frog (Rana ridibunda) male with inflated vocal sacs. Bulgaria. May.

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.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) jumping, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frogs (Pelophylax ridibundus) jumping, one with its mouth open, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) jumping after plastic bottle lid, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) jumping, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) jumping and biting onto plastic bottle lid, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) jumping, Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) sitting on a Water chestnut (Trapa natans) carpet. Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Marsh frog (Pelophylax ridibundus) sitting on a Water chestnut (Trapa natans) carpet. Danube Delta, Romania, June.

Colin Varndell / Marsh Frog (Rana ridibunda) in water. Bexington, Dorset, UK, May.

Colin Varndell / Marsh frog (Rana ridibunda) at rest, Bexington, Dorset, England, UK, May

Roger Powell / Marsh frog (Rana ridibunda) in breeding pond, Guerreiro, Castro Verde, Alentejo, Portugal, May

Roger Powell / Marsh Frog (Rana ridibunda) calling in breeding pond, Guerreiro, Castro Verde, Alentejo, Portugal, May

Colin Varndell / Marsh Frog (Rana ridibunda). Bexington, Dorset, UK, May.

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

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

Andy Sands / Marsh Frog (Rana ridibunda) showing prominent vocal sacs. East Sussex, England, April.

Ross Hoddinott / Marsh Frog (Pelophylax / Rana ridibunda) portrait. Captive. North Devon, UK, June.

Colin Varndell / Portrait of an adult Marsh Frog (Rana ridibunda). Captive. Surrey, UK, September.

Stephen Dalton / Marsh frog (Rana ridibunda) portrait, Europe

Stephen Dalton / Marsh frog (Rana ridibunda) swimming, Europe

Stephen Dalton / Marsh frog (Rana ridibunda) leaping, controlled conditions, Europe

Stephen Dalton / Marsh frog (Rana ridibunda) portrait, controlled conditions, from Europe

Stephen Dalton / Marsh frog {Rana ridibunda} swimming, controlled conditions, from Europe

Wild Wonders of Europe / della Ferrera / Marsh frog (Rana ridibunda) with head above water, Bastasi area, Livanjsko Polje (karst plateau) Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Maitland / Marsh frog (Pelophylax / Rana ridibundus) escaping predators by diving to the bottom of the lake amongst reed roots and stems, Lagadin region, Lake Ohrid, Galicica National Park, Macedonia, June 2009

Wild Wonders of Europe / Oxford / Marsh frog (Rana ridibunda) calling, Sierra de Andújar Natural Park, Mediterranean woodland of Sierra Morena, north east Jaén Province, Andalusia, Spain, April 2009

Alan Williams / Marsh frog (Rana ridibunda) male calling from ditch in Cliffe Marshes, Kent, UK, May

Alan Williams / Marsh frog (Rana ridibunda) in water, Cliffe Marshes, Kent, UK, May

Alan Williams / Marsh frog (Rana ridibunda) in water, Cliffe Marshes, Kent, UK, May

Alan Williams / Marsh frog (Rana ridibunda) swimming through water, Cliffe Marshes, Kent, UK, May

Alan Williams / Marsh frog (Rana ridibunda) in water, Cliffe Marshes, Kent, UK, May

Simon Colmer / Marsh frog (Rana ridibunda) sitting on lily pad, UK

Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) reflected in water, Spain

Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) male vocalising at water surface clearly showing vocal sacs, Spain

Jose B. Ruiz / Marsh frog (Rana ridibunda perezii) at water surface, Spain

Jose B. Ruiz / Marsh frog (Rana ridibunda perezi) Spain

Jose B. Ruiz / Marsh frog (Rana ridibunda perezi) reflected in water, Spain

David Kjaer / Marsh frog calling in pond {Rana ridibunda} Sussex, UK.

Igor Shpilenok / Close-up of Marsh frog {Vipera berus} in water, Bryanksy Les Zapovednik, Russia.

Igor Shpilenok / Marsh frog {Vipera berus} in water, Bryanksy Les Zapovednik, Russia.

Juan Manuel Borrero / Marsh frog {Rana ridibunda} Delta del Ebro NP. Spain.

Philippe Clement / Marsh frog {Rana ridibunda} France

Philippe Clement / Marsh frog {Rana ridibunda} France

David Kjaer / Marsh frog calling, Sussex, UK.

Nigel Marven / Marsh frog with vocal sacs inflated in pool {Rana ridibunda} Iran

Guy Edwardes / Marsh frog (Pelophylax ridibundus) in pond vocalising, courtship display, near Bratsigovo, Bulgaria. May.

Guy Edwardes / Marsh frog (Pelophylax ridibundus) in pond vocalising, courtship display, near Bratsigovo, Bulgaria. May.

Guy Edwardes / Marsh frog (Pelophylax ridibundus) in pond, near Bratsigovo, Bulgaria. June.

Roland Seitre / Eurasian Marsh Frog (Pelophylax ridibundus) camouflaged on rock, captive, occurs in Europe.

David Pattyn / Marsh Frog (Pelophylax ridibundus) in water, Lake Kerkini area, Greece, July.

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

Bence Mate / Bittern (Botaurus stellaris) with marsh frog (Rana ridibundus) that has just woken up from hibernation, Kiskunsag National Park, Hungary. Honoured in the Montier Photo Awards 2020.