Daniel Heuclin / Close up of skin of Rainbow boa (Epicrates cenchria cenchria) captive, from French Guiana

Andrew Snyder / Rainbow boa (Epicrates cenchria showing iridescence on head, Iwokrama, Guyana.

Lucas Bustamante / Rainbow boa (Epicrates cenchria) wound round branch over water, Tambopata, Madre de Dios, Peru.

Michael D. Kern / Rainbow boa (Epicrates cenchria cenchria) captive. Small repro only

Thomas Marent / Rainbow Boa (Epicrates cenchria) juvenile, Amacayacu National Park, Leticia, Colombia

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) shed skin, native to Central and South America

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) young, native to Central and South America

Pete Oxford / Rainbow boa (Epicrates cenchria cenchria) juvenile, Amazon, Ecuador. Captive, occurs in Central and South America.

MYN / Andrew Snyder / Brazilian Rainbow boa (Epicrates cenchria), Berbice River, Guyana, September. Meetyourneighbours.net project.

MYN / Andrew Snyder / Brazilian Rainbow boa (Epicrates cenchria), Berbice River, Guyana, September. Meetyourneighbours.net project.

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) juvenile, native to South America

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) juvenile, native to South America

Rod Williams / Rainbow boa (Epicrates cenchris cenchris) head portrait. Captive, occurs Brazil.

Daniel Heuclin / Rainbow boa (Epicrates cenchria cenchria) studio shot, captive, from French Guiana

Daniel Heuclin / Rainbow boa (Epicrates cenchria cenchria) studio shot, captive, from French Guiana

Daniel Heuclin / Rainbow boa (Epicrates cenchria cenchria) studio shot, captive, from French Guiana

Pete Oxford / Close up of skin of Rainbow Boa (Epicrates cenchria cenchria) captive, Ecuador

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) captive, Ecuador

Michael D. Kern / Brasilian rainbow boa (Epicrates cenchria cenchria) captive, from South America

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria), native to Central and South America

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) flicking tongue while hanging, native to Central and South America

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) coiled around branch, native to Central and South America

Murray Cooper / Rainbow Boa (Epicrates cenchria) in leaf litter, Ecuador

Murray Cooper / Rainbow Boa (Epicrates cenchria) in leaf litter, Amazon, Ecuador

Rod Williams / Rainbow boa {Epicrates cenchris cenchris} male, captive, from Brazil

Rod Williams / Rainbow boa {Epicrates cenchris} female, captive, from South America

Nick Gordon / Rainbow boa coiled around tree (Epicrates cenchris) Amazonia, Brazil

Miles Barton / Newborn Brazilian rainbow boa (Epicrates cenchris cenchris) Brazil, South America

John Cancalosi / Rainbow boa wrapped around tree {Epicrates cenchris} Rainforest, Amazon Basin, Peru

LYNN M. STONE / Rainbow boa constrictor swallowing rat {Epicrates cenchris} captive

LYNN M. STONE / Rainbow boa {Epicrates cenchria} captive

MORLEY READ / Rainbow boa (Epicrates cenchris) on forest floor at night, note the irridescence of the skin, Ecuador, South America

Pete Oxford / Rainbow Boa {Epicrates cenchris} Amazon, Ecuador

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) adult, Amazon rainforest, Ecuador

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) adult, Amazon rainforest, Ecuador

Michael & Patricia Fogden / Rainbow Boa (Epicrates cenchria cenchria) in the rainforest, Costa Rica

Claus Meyer / Rainbow Boa (Epicrates cenchria) hanging from tree branch, Caatinga ecosystem, Brazil

Barry Mansell / Rainbow boa {Epicrates cenchris} captive, occurs South America

LYNN M. STONE / Rainbow boa eating a rat {Epicrates cenchria} captive, from South America

LYNN M. STONE / Rainbow boa {Epicrates cenchria} captive, from South America

Thomas Marent / Rainbow Boa (Epicrates cenchria) juvenile, Amacayacu National Park, Leticia, Colombia

Pete Oxford / Rainbow Boa (Epicrates cenchria cenchria) juvenile, native to South America

Daniel Nunez / Rainbow boa (Epicrates cenchria) coiled up on tree branch, Amazon rainforest, Loreto, Peru.

Maxime Aliaga / Rainbow boa (Epicrates cenchria) alert on tree trunk. Pacaya Samiria National Park, Peru.

Lucas Bustamante / Rainbow boa (Epicrates cenchria) coiled up, close-up portrait showing eye and scales , Yasuni National Park, Orellana, Ecuador.

Joel Sartore / Photo Ark / Brazilian rainbow boa (Epicrates cenchria cenchria) portrait, John Ball Zoo. Captive, occurs in Central and South America.

Joel Sartore / Photo Ark / Brazilian rainbow boa (Epicrates cenchria cenchria) head portrait, John Ball Zoo. Captive, occurs in Central and South America.

Roland Seitre / Rainbow boa (Epicrates cenchria cenchria) showing iridescence of the scales. Captive, occurs in Central and South America.

Morley Read / Rainbow boa (Epicrates cenchria) photographed in the wild. Rainforest, Yasuni National Park, Ecuador.

Guy Edwardes / Rainbow boa (Epicrates cenchria) on log above river in cloud forest. Arenal, Costa Rica. Controlled conditions.

Suzi Eszterhas / Rainbow boa (Epicrates cenchria), Amazon, Brazil. June.