Claus Meyer / Two-striped Forest Pit Viper (Bothrops bilineatus) coiled around plant, front view, Atlantic Forest ecosystem, Brazil

Claus Meyer / Two-striped Forest Pit Viper (Bothrops bilineatus) hanging on a Heliconia (Heliconia sp) flower, Atlantic Forest, Brazil

Luiz Claudio Marigo / Jararaca snake {Bothrops jararaca} Brazil

Mark Moffett / Jararaca (Bothrops jararaca) coiled in vegetation, most common viper in the Atlantic Forest, Brazil

Michael & Patricia Fogden / Two-striped Forest Pit Viper (Bothrops bilineatus) coiled on rainforest floor using tip of tail as lure, an example of caudal luring, Amazon, Peru

Claus Meyer / Two-striped Forest Pit Viper (Bothrops bilineatus) coiled around plant, Atlantic Forest ecosystem, Brazil

Claus Meyer / Two-striped Forest Pit Viper (Bothrops bilineatus) coiled around grasses, Atlantic Forest ecosystem, Brazil

Mark Moffett / Jararaca (Bothrops jararaca) climbing tree trunk, most common viper in the Atlantic Forest, Brazil