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

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

Philippe Clement / Cuban boa (Epicrates angulifer) resting. Captive, occurs in Cuba and the Bahamas.

Philippe Clement / Cuban boa (Epicrates angulifer) resting. Captive, occurs in Cuba and the Bahamas.

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.

JIM CLARE / Children handling a Boa (Epicrates sp) at rescue centre in Amazon lowlands, captive, Eucador

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.