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David Attenborough demonstrates how a cobra uses its venom to deter its enemies without even biting them. For safety, he wears a visor that has been coated with a substance that turns pink when it comes into contact with venom. The snake watches David's approach and when he gets too close lets loose a stream of venom, spraying it from side to side to give it the best chance of blinding its victim. David's visor is covered with pink dots, each one a bead of venom that would have caused extreme pain as well as blindness.