Piranhas take a bite out of Edmonton

Piranhas take a bite out of Edmonton
The Grande Prairie Piranhas took a selection of swimmers to Edmonton last weekend, to test themselves against Alberta’s best age-group swimmers at the J.P. Fiset Swim Meet. There were plenty of opportunities for Piranhas to nail down best times and medals, and they did so in both regards.[...]
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Fish – piranhas will even try and bite through metal – Ultimate Killers – BBC wildlife

In less than a couple of minutes a pack of piranhas strip a duck to the bone. These are extremely scary fish that will even try to bite through metal. From the BBC.