David Attenborough's Natural Curiosities

Season 1 Episode 4

A Curious Twist

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Aired Unknown Feb 19, 2013 on Watch
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Both the narwhal and the snail have developed a twist: the narwhal with its ferocious prong and the snail with its chic mobile home. David Attenborough questions why spirals are so widespread in nature. He gleans some answers by examining the narwhal's tusk and the spiral shells found on snails and ammonites, as he continues to discover nature's evolutionary anomalies.moreless
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