Pete Oxford / Giant Titicaca Lake frog {Telmatobius culeus} Lake Titicaca. Bolivia / Peru

Stephen Dalton / Horned frog (Ceratophrys ornata) sitting on leaves, controlled conditions, from South America

David Kjaer / Chacoan / Ornate Horned Frog {Ceratophrys cranwelli} Captive

Pete Oxford / Giant aquatic frog {Telmatobius escomeli} Altiplano lakes, Peru

Marcelo rocha / John Downer Pr / Rear view of Eyespot / False eyed frog, with defensive eye-like markings to frighten away predators (Resolution restriction - image digitised from film, 'Weird Nature' tv series)

Mark Carwardine / Argentine horned / ornate frog (Ceratophrys ornata) sitting in water, captive.

Mark Carwardine / Argentine horned / ornate frog (Ceratophrys ornata) sitting in water, captive

Rod Williams / Ornate horned frog (Ceratophrys ornata) captive, rare yellow form from Argentina, Uruguay, Brazil

Pete Oxford / Amazon horned frog (Ceratophrys cornuta) mating pair on rainforest floor, Iwokrama Reserve, Guyana

Pete Oxford / Amazon horned frog (Ceratophrys cornuta) in rainforest, Iwokrama Reserve, Guyana

Michael D. Kern / Chacoan horned / albino pacman frog (Ceratophrys cranwelli) captive, from Argentina

Stephen Dalton / Close up of eye of Horned frog {Ceratophrys ornata} controlled conditions, from South America

Barry Mansell / Brazilian horned frog (Ceratophrys aurita) on tree trunk, Brazil, South America

Robert Thompson / Amazon horned frog {Ceratophrys cornuta} Argentina, South America, June

Robert Thompson / Amazon horned frog {Ceratophrys cornuta} Argentina, South America, June

Pete Oxford / Giant titicaca frog (Telmatobius culeus) being weighed by research scientist, Esther Perez, Lake Titicaca, Bolivia, critically endagered

Pete Oxford / Giant titicaca frog (Telmatobius culeus) in water, captive, Lake Titicaca, Bolivia, critically endagered

Michael D. Kern / Argentine Horned / Pacman Frog {Ceratophrys ornata} captive, from tropical rainforest of South America

Michael D. Kern / Argentine Horned / Pacman Frog {Ceratophrys ornata} captive, from tropical rainforest of South America

Tony Phelps / Chacoan horned frog {Ceratophrys cranwelli} South America

Rolf Nussbaumer / Eastern Barking Frog {Eleutherodactylus augusti latrans} Texas, USA

Rolf Nussbaumer / Cliff Chirping Frog {Eleutherodactylus marnockii} male at night calling with vocal sac inflated, Hill Country, Texas, USA

Rolf Nussbaumer / Eastern Barking Frog {Eleutherodactylus augusti latrans} adult in limestone canyon, Texas, USA

Doug Wechsler / Red-eyed Coqui frog / Coqui Churi {Eleutherodactylus antillensis} male voalising, St. John, Virgin Islands

Rod Williams / Colombian horned frog {Ceratophrys calcarata} juvenile, from South America

Rod Williams / Argentine horned frog {Ceratophrys ornata} juvenile, rare melanistic form, captive, from Argentina

Rod Williams / Argentine horned frog {Ceratophrys ornata} female, captive, from Argentina

Mike Potts / Atkins robber frog {Eleutherodactylus atkinsi} Alexanda von Humboldt NP, Cuba

John Cancalosi / Horned frog (Ceratophrys ornata) eating another frog (S. couchi) South America

Doug Wechsler / Frog {Ischnocnema quixensis} Ecuador

Rod Williams / Colombian horned frog {Ceratophrys calcarata} juvenile, captive, from South America

MORLEY READ / Frog {Lithodytes lineatus} Ecuador

MORLEY READ / Frog {Eleutherodactylus conspicillatus} Ecuador

MORLEY READ / Frog {Vanzolinius discodactylus} Yasuni NP, Ecuador

Doug Wechsler / Common dink frog viewed through glass {Eleutherodactylus diadematus} Costa Rica

Pete Oxford / Giant titicaca frog rearing pools {Telmatobius culeus} Lake Titicaca, Bolivia

Tony Phelps / Chacoan horned frog portrait {Ceratophrys cranwelli} South America

MORLEY READ / Frog portrait in lowland rainforest {Eleutherodactylus sulcatus} Yasuni NP, Ecuador

MORLEY READ / Tree frog {Eleutherodactylus ockendeni} Yasuni NP, Ecuador

MORLEY READ / Frog {Edalorhina perezi} Yasuni NP, Ecuador

MORLEY READ / Frogs mating {Edalorhina perezi} Yasuni NP, Ecuador

MORLEY READ / Frog on fern in lowland rainforest {Eleutherodactylus diadematus} Yasuni NP, Ecuador

MORLEY READ / Frog on fern in lowland rainforest {Eleutherodactylus acuminatus} Yasuni NP, Ecuador

Rod Williams / Chacoan horned frog {Ceratophrys cranwelli} juvenile, captive, from Argentina

Rolf Nussbaumer / Puerto rican coqui frog {Eleutherodactylus Coqui} adult on heliconia, El Yunque, Caribbean National Forest, Puerto Rico.

Mike Potts / Rainforest frog {Eleutherodactylus iberia} Alexander von Humboldt NP, Cuba, world's smallest frog

Barry Mansell / Barking frog {Eleutherodactylus augusti} Mexico.

Gabriel Rojo / Frog {Leptodactylus ocellatus} La Pampa, Argentina

Pete Oxford / Treefrog in Amazon rainforest, Ecuador, South America.