Pete Oxford / Amazon Tree Boa (Corallus hortulanus) in rainforest, Iwokrama Reserve, Guyana, digitally manipulated image

Alex Hyde / Madagascar tree boa {Sanzinia madagascariensis} tropical rainforest. Masoala Peninsula National Park, north east Madagascar.

Pete Oxford / Common Tree Boa (Corallus hortulanus) coiled around branch, Iwokrama Rainforest Reserve, Guyana, manipulated image

Pete Oxford / Common Tree Boa (Corallus hortulanus) climbing in tree, Iwokrama Rainforest Reserve, Guyana, manipulated image

Pete Oxford / Common Tree Boa (Corallus hortulanus) wrapped around branch, Iwokrama Rainforest Reserve, Guyana, manipulated image

Michael D. Kern / Amazon tree boa snake {Corallus hortulanus} portrait with tongue extended, captive, South America

Mary McDonald / Boa constrictor (Constrictor constrictor). South America

Pete Oxford / Emerald Tree Boa (Corallus caninus) showing thermoreceptors between the labial scales, Amazon, Ecuador

Pete Oxford / Emerald Tree Boa (Corallus caninus) adult, Amazon, Ecuador

Gerry Ellis / Emerald Tree Boa (Corallus caninus) hanging on tree branch, Amazon, Peru

Michael & Patricia Fogden / Emerald Tree Boa (Corallus caninus) portrait in rainforest, South America

Pete Oxford / Boa Constrictor (Boa constrictor) coiled around a mossy tree branch in the rainforest, South America