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The World's Largest Snake

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How a group of scientists uncovered the remains of a 48ft-long snake weighing more than a ton in the Cerrejon coal mines in north-east Colombia in 2009. The discovery revealed that the creature, a relative of boa constrictors, lived in the Colombian rainforest 58 to 60 million years ago. The programme uses CGI to visualise when huge reptiles were once again living on Earth after the end of dinosaurs.

Nature Documentary

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