Morley Read / Parrot snake (Leptophis ahaetulla) threat display, Amazon rainforest, Orellana Province, Ecuador.

Paul Hobson / Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica.

Martin Gabriel / Green parrot snake (Leptophis ahaetulla) defensive attack, Tenorio National Park, Costa Rica

Claus Meyer / Parrot Snake (Leptophis ahaetulla) with mouth open in defense display, Caatinga ecosystem, Brazil

Morley Read / Slow motion clip of a Fer de Lance (Bothrops atrox) smelling with its tongue, Orellana Province, Ecuador.

Morley Read / Parrot snake (Leptophis ahaetulla) threat display, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Parrot snake (Leptophis ahaetulla), with a fly on its head, enters its mouth, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Parrot snake (Leptophis ahaetulla) threat display, Amazon rainforest, Orellana Province, Ecuador.

Paul Hobson / Parrot snake (Leptophis ahaetulla) head, looking at camera. Costa Rica.

Lucas Bustamante / Chocoan parrot snake (Leptophis bocourti) on heliconia flower with fly in background, Sarapiqui, Heredia, Costa Rica.

Pete Oxford / Parrot Snake (Liophis ahaetulla) against bark. Orinoco River, Apure Province, Venezuela.

Fabio Liverani / Parrot snake {Leptophis ahaetulla} with mouth open, Tambopata National Reserve, Amazonia, Peru

Fabio Liverani / Parrot snake {Leptophis ahaetulla} with mouth wide open, Tambopata National Reserve, Amazonia, Peru

Fabio Liverani / Parrot snake {Leptophis ahaetulla} Tambopata National Reserve, Amazonia, Peru

Michael D. Kern / Amazon parrot snake {Leptophis ahaetulla} with mouth open, captive, occurs South America, Trinidad and Tobago

Luiz Claudio Marigo / Parrot / Green tree snake {Leptophis ahaetulla} flooded forest, Amazonas, Brazil

Luiz Claudio Marigo / Parrot / Green tree snake {Leptophis ahaetulla} flooded forest, Amazonas, Brazil

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) with open mouth, Barro Colorado Island, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) approaching Red-eyed Tree Frog (Agalychnis callidryas), Soberania National Park, Panama

Michael & Patricia Fogden / Parrot Snake (Leptophis ahaetulla) defensive threat display, rainforest Costa Rica

Michael & Patricia Fogden / Parrot Snake (Leptophis ahaetulla) defensive threat display, rainforest, Costa Rica

Claus Meyer / Parrot Snake (Leptophis ahaetulla) hanging from tree showing defensive display, Caatinga ecosystem, Brazil

Claus Meyer / Parrot Snake (Leptophis ahaetulla) in threat display, Caatinga ecosystem, Brazil

Tim Fitzharris / Parrot Snake (Leptophis ahaetulla) head, Costa Rica

Mark Moffett / Parrot Snake (Leptophis ahaetulla) with open mouth, Barro Colorado Island, Panama

Mark Moffett / Parrot Snake (Leptophis ahaetulla) hanging from tree, Panama

Visuals Unlimited / Parrot Snake (Leptophis ahaetuella) searching for a meal of frog or insects on the Osa Peninsula of Costa Rica.

Cyril Ruoso / Parrot Snake (Leptophis ahaetulla) feeding on frog, Golfito, Costa Rica