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David Attenborough's Natural Curiosities S4 Ep5: Incredible ShellsSir David Attenborough investigates two shells that win at evolution.

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Now PlayingDavid Attenborough's Natural Curiosities S4 Ep5: Incredible ShellsSir David Attenborough investigates two shells that win at evolution.0David Attenborough's Natural Curiosities S4 Ep6: Ferocious FightersSir David Attenborough explores animals with fighting behavior.