Nick Garbutt / Sumatran pit viper (Trimeresurus sumatranus) juvenile on tree trunk, in tropical rainforest. Danum Valley, Sabah, Borneo, Malaysia.

Chien Lee / Ecuadorian Toad-headed Pit-viper (Bothrocophias campbelli) in rainforest, Mashpi Amagusa Reserve, Pichincha, Ecuador

Nick Garbutt / Pope's pit / tree viper (Trimeresurus popeorum) in lowland forest. Danum Valley, Sabah, Borneo, Malaysia

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

Michael & Patricia Fogden / Eyelash Viper (Bothriechis schlegelii) gold morph camouflaged among palm fruits, rainforest, Costa Rica

Michael & Patricia Fogden / Eyelash Viper (Bothriechis schlegelii) showing loreal pits for detecting heat, rainforest, Costa Rica

Michael & Patricia Fogden / Eyelash Viper (Bothriechis schlegelii) gold morph lying in wait on Heliconia (Heliconia imbricata) to strike at Rufous-tailed Hummingbird (Amazilia tzacatl) rainforest, Costa Rica

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