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

Pete Oxford / Two-striped Forest Pit Viper with one-day- old young. Amazonia, Ecuador

Pete Oxford / Two striped forest pit viper with young {Bothriopis bilineatus} Ecuador Amazon, South America

Pete Oxford / Two Striped Forest Pit Viper mother with day old young. Ecuadorian Amazon rainforest.

Pete Oxford / Two Striped Forest Pit Viper, Ecuadorian Amazon, South America

Pete Oxford / Two striped forest pit viper snake with young, fangs open {Bothriopis bilineatus} Amazon rainforest, Ecuador

Lucas Bustamante / Green jararaca / Two striped forest pit viper (Bothriopsis bilineata) on branch, Tambopata, Madre de Dios, Peru.

Lucas Bustamante / Two striped forest pitviper (Bothriopsis bilineata) curled up on log, Yasuni National Park, Orellana, Ecuador.

Pete Oxford / Two-striped forest pitviper (Bothriopsis bilineata smaragdina) Amazon, Ecuador. Captive, occurs in the Amazon.

Pete Oxford / Two-striped forest pitviper (Bothriopsis bilineata smaragdina) Amazon, Ecuador. Captive, occurs in the Amazon.

MYN / Andrew Snyder / Bi-striped viper (Bothriopsis bilineata) Chenapau, Guyana. Meetyourneighbours.net project.

MYN / Andrew Snyder / Bi-striped viper (Bothriopsis bilineata) Chenapau, Guyana. Meetyourneighbours.net project.

Daniel Heuclin / Two-striped Forest Pitviper (Bothriopsis bilineatus) coiled in a defensive strike-ready pose around frond. Captive. Endemic to Bolivia.

Daniel Heuclin / Two-striped Forest Pitviper (Bothriopsis bilineatus) coiled in a defensive pose around frond. Captive. Endemic to Bolivia.

Pete Oxford / Young Two striped forest pit viper (Bothriopis bilineatus) in middle of skin moult, Ecuador, South America

Pete Oxford / Two striped forest pit viper (Bothriopis bilineatus) eating a whole rat, sequence 2/3, Ecuador, South America Controlled conditions

Pete Oxford / Two striped forest pit viper (Bothriopis bilineatus) showing defecation, Ecuador, South America

Pete Oxford / Two striped forest pit viper (Bothriopis bilineatus) eating a whole rat, sequence 3/3, Ecuador, South America - controlled conditions

Pete Oxford / Two Striped forest pit viper (Bothriopis bilineatus) Ecuadorian Amazon, Ecuador, South America

Pete Oxford / Two Striped forest pit viper (Bothriopis bilineatus) Ecuadorian Amazon, Ecuador, South America

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

Pete Oxford / Two Striped Forest Pit Viper (Bothriopis bilineatus) Ecuador Ecuadorian Amazon, South America

Lucas Bustamante / Two-striped forest-pitviper (Bothrops bilineatus) resting on leaf at night, Yasuni National Park, Orellana, Ecuador.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) on a branch, from Venezuela to Brazil. Captive.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) on a branch, from Venezuela to Brazil. Captive.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) from Venezuela to Brazil. Captive.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) from Venezuela to Brazil. Captive.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) on a branch, from Venezuela to Brazil. Captive.

Daniel Heuclin / Two-striped forest pit viper (Bothrops bilineatus bilineatus) on a branch, forming an 'S' shape, from Venezuela to Brazil. Captive.