Pythons and boas are constrictors - snakes which kill their prey by suffocation rather than with venom. Pythons lay eggs whilst boas bear live young.
Scientific name: Boidae
The shading illustrates the diversity of this group - the darker the colour the greater the number of species. Data provided by WWF's Wildfinder.
Take a trip through the natural world with our themed collections of video clips from the natural history archive.
Like nowhere else on Earth, the mystery and magic of Madagascar leaves a vivid impression on all those who visit, and none more so than David Attenborough.
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