Brian Bevan / Surinam horned frog (Ceratophrys cornuta) eating a locust, UK. Captive, native to the Americas.

Claudio Contreras / Texas horned lizard (Phrynosoma cornutum) portrait, Laredo Borderlands, Texas, USA. April

Chris Mattison / Horned frog (Ceratophrys sp) in shallow water, captive occurs in South America.

Tim Laman / Head portrait of Bornean Horned Frog (Megophrys nasuta) among the leaf litter in the lowland rainforest of Borneo. Danum Valley Conservation Area, Sabah, Malaysia

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

Nick Garbutt / Bornean horned frog (Megophrys nasuta) on forest floor. Danum Valley, Sabah, Borneo, Malaysia

Nick Garbutt / Bornean horned frog (Megophrys nasuta) amongst leaf-litter on forest floor. Danum Valley, Sabah, Borneo, Malaysia

Nick Garbutt / Montane horned frog (Megophrys kobayashii) in leaf litter. Slopes of Mt Kinabalu (around 1400m), Sabah, Borneo, Malaysia

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

Chien Lee / Kobayashi's Horned Frog (Megophrys kobayashii), Kinabalu National Park, Sabah, Malaysia

Chien Lee / Amazon Horned Frog (Ceratophrys cornuta), Yasuni National Park, Ecuador

Chien Lee / Amazon Horned Frog (Ceratophrys cornuta) camouflaged in leaf litter, Yasuni National Park, Ecuador

Chien Lee / Amazon Horned Frog (Ceratophrys cornuta), Yasuni National Park, Ecuador

Chien Lee / Asian Horned Frog (Megophrys nasuta) female, Gunung Penrissen, Sarawak, Borneo, Malaysia

Pete Oxford / Pacific Horned Frog (Ceratophrys stolzmanni), native to South America

Chien Lee / Asian Horned Frog (Megophrys nasuta) camouflaged in leaf litter, Danum Valley Field Center, Sabah, Borneo, Malaysia

Heidi & Hans-Juergen Koch / Cranwell's Horned Frog (Ceratophrys cranwelli) has a large mouth and voracious appetite, native to South America

Emanuele Biggi / Vivaria used for captive breeding of Horned marsupial frogs (Gastrotheca cornuta) at the EVACC (El Valle de Anton Conservation Centre), El Valle de Anton, Panama.

Wayne Wu Ying / Wild Wonders of China / Short-legged horned toad (Xenophrys brachykolos) Tai Tam Country Park, Hong Kong, China

Nick Garbutt / Portrait of Bornean Horned Frog (Megophrys nasuta) amongst leaf-litter in forest floor. Taken at night. Danum Valley, Sabah, Borneo.

Morley Read / Ecuador horned treefrog (Hemiphractus bubalus), Cordillera del Condor, Zamora Chinchipe Province, Ecuador.

Robert Valentic / Perak horned toad (Megophrys aceras) Gunung Raya / Mt Raya. on Pulau Langkawi, Malaysia.

Alex Hyde / Amazonian Horned Frog (Ceratophrys cornuta) camouflaged amongst leaf litter on lowland rainforest floor, waiting to ambush passing prey. Manu Biosphere Reserve, Amazonia, Peru. November.

Alex Hyde / Amazonian Horned Frog (Ceratophrys cornuta) camouflaged amongst leaf litter on lowland rainforest floor, waiting to ambush passing prey. Manu Biosphere Reserve, Amazonia, Peru. November.

Alex Hyde / Amazonian Horned Frog (Ceratophrys cornuta) camouflaged amongst leaf litter on lowland rainforest floor, waiting to ambush passing prey. Manu Biosphere Reserve, Amazonia, Peru. November.

Alex Hyde / Amazonian Horned Frog (Ceratophrys cornuta) photographed on a white background in mobile field studio. Manu Biosphere Reserve, Amazonia, Peru. November.

Alex Hyde / Amazonian Horned Frog (Ceratophrys cornuta) photographed on a white background in mobile field studio. Manu Biosphere Reserve, Amazonia, Peru. November.

Alex Hyde / RF - Amazonian Horned Frog (Ceratophrys cornuta) camouflaged amongst leaf litter on lowland rainforest floor, waiting to ambush passing prey. Manu Biosphere Reserve, Amazonia, Peru. November. (This im...

Nick Garbutt / Amazon / Surinam horned frog (Ceratophrys cornuta) camouflaged in leaf litter. Manu Biosphere Reserve, Peru.

Nick Garbutt / Amazon / Surinam horned frog (Ceratophrys cornuta) camouflaged in leaf litter. Manu Biosphere Reserve, Peru.

Magnus Lundgren / Wild Wonders of China / Short-legged horned toad (Megophrys brachykolos) Tai Tam Country Park, Hong Kong Island, China.

Magnus Lundgren / Wild Wonders of China / Short-legged horned toad (Megophrys brachykolos) held in human hand, showing white tubercles, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Short-legged horned / Peak spadefoot toad (Megophrys brachykolos) sitting on ground. Wuliangshan Nature Reserve in Jingdong, Yunnan Province, China.

Ernie Janes / RF - Argentine horned frog (Ceratophrys ornata) albino variety, captive. Occurs in Brazil, Uraguay and Argentina. (This image may be licensed either as rights managed or royalty free.)

Ernie Janes / Argentine horned frog (Ceratophrys ornata) captive. Occurs in Brazil, Uruguay, and Argentina.

Ernie Janes / Argentine horned frog (Ceratophrys ornata) close up of skin, captive. Occurs in Brazil, Uruguay, and Argentina.

Brian Bevan / Horned frog (Ceratophrys ornata) catching a cricket, UK. Captive, native to South America.

Emanuele Biggi / Peruvian horned frog (Ceratophrys cornuta) camouflaged in leaf litter, Peru

Emanuele Biggi / Peruvian horned frog (Ceratophrys cornuta) peering above leaf litter, Peru

Emanuele Biggi / Peruvian horned frog (Ceratophrys cornuta) camouflaged in leaf litter, Peru

Emanuele Biggi / Peruvian horned frog (Ceratophrys cornuta) camouflaged in leaf litter, Peru

Lucas Bustamante / Amazon horned frog (Ceratophrys cornuta) portrait, Yasuni National Park, Orellana, Ecuador.

Lucas Bustamante / Amazon horned frog (Ceratophrys cornuta) on leaf, Yasuni National Park, Orellana, Ecuador.

Joao Burini / Horned frog (Proceratophrys boiei) Parque do Zizo Private reserve, Sao Paulo, Atlantic Forest South-East Reserves, UNESCO World Heritage Site, Brazil.

Edwin Giesbers / Asian / Javan horned frog (Megophrys montana) captive

Edwin Giesbers / Asian / Javan horned frog (Megophrys montana) captive

Roland Seitre / Horned madagascar frog (Mantidactylus cornutus) two different colour morphs, Madagascar.

Nick Garbutt / Montane horned frog (Megophrys kobayashii) in the leaf litter. Slopes of Mt Kinabalu (around 1400ml), Sabah, Borneo,