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

Daniel Heuclin / Sunda island pitviper (Trimeresurus insularis) in tree, Komodo Island.

Pete Oxford / Osborne's Lancehead (Bothrops osbornei) juvenile showing differently colored tail tip used for caudal luring, native to South America

Pete Oxford / Fer-de-lance (Bothrops asper), native to South America

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

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

Morley Read / Fer de Lance (Bothrops atrox) on the rainforest floor, Orellana Province, Ecuador. (non-ex)

Nick Garbutt / Sumatran pit viper (Trimeresurus sumatranus) juvenile on trunk. Danum Valley, Sabah, Borneo, Malaysia. Focus stacked image.

Duncan Murrell / Sri Lankan green pit viper (Trimeresurus trigonocephalus). Laxapana Falls, Sri lanka.

Duncan Murrell / Sri Lankan Green Pit Viper (Trimeresurus trigonocephalus). Laxapana Falls, Sri lanka.

Robert Valentic / Vogel's pit viper (Trimeresurus vogeli) male in elevated rainforest habitat within the Bach Ma National Park in central Vietnam. Dry season.