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

Edwin Giesbers / Madagascar ground boa (Acrantophis madagascariensis) Berenty Reserve, Madagascar

Michael D. Kern / Red Tailed Boa {Boa constrictor constrictor} captive, from South America

David Welling / Green tree python (Chondopython viridis) coiled on tree, captive

Pete Oxford / Anaconda {Eunectes murinus) after ingesting Peccary prey, night, Amazon, Ecuador, South America

Michael D. Kern / Green tree python snake {Morelia / Chondopython viridis} portrait, captive, occurs Papua New Guinea and Indonesia

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

Peter Blackwell / Rock python {Python sebae} constricting a Thomson's gazelle {Gazella thomsoni} Masai Mara, Kenya. Gazelle eventually escaped.

Ingo Arndt / Carpet python snake (Morelia spilota variegata), Australia. Captive

Ingo Arndt / Juvenile Green Tree Python (Chondopython viridis), Papua New Guinea.

Ingo Arndt / Carpet python (Morelia spilota) showing protruding hemipenis, Australia.

Ingo Arndt / Green Tree Python (Chondopython viridis), Papua New Guinea.