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S2 Ep16. It’s a “living fossil”! This fish can resist piranha attacks and is inspiring a new body armour. The arapaima has been swimming the waters of the Amazon for millions of years. It’s also home to a famous predator, the fearsome piranha. The Arapaima has a secret weapon – it’s scales are both tough and flexible and they’ve caught the attention of scientists. Get in touch: www.bbcworldservice.com/30animals #30Animals