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Megapiranha

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Scientist and angler Justin Grubich shows off his catch – a fish called pacu, vegetarian cousin to the piranha, that has human-like molars and eats fruit and nuts.
Piranhas - the stuff of nightmares and legends. They're infamous for how fast they can devour prey, and are known to attack in groups of up to 100. Now, a team of scientists is heading to the Amazon to investigate a piranha mystery of immense proportions. A fossil of a giant jaw fragment has been identified as an ancient piranha, but with a terrifying twist: the tooth belonged to a fish seven times the size of existing piranha species.

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