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

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. (non-ex)

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

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

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

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