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

Pete Oxford / Eyelash viper {Bothrops schlegeli} on Heliconia, Esmeraldas, Ecuador

LYNN M. STONE / Eyelash viper coiled {Bothrops schlegeli} captive

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 / Eyelash viper {Bothrops schlegeli} on Heliconia Esmeraldas, Ecuador

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)

Melvin Grey / Hog-nosed pit viper (Porthidium nasutum) Atlantic Lowland Rainforest, Costa Rica.

Melvin Grey / Side-striped palm pit viper (Bothriechis lateralis) adult, Costa Rica

Paul Hobson / Hognosed pitviper (Porthidium nasutum). Costa Rica.