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Noisy Motorboats Disrupt Hunting and Threaten Survival of Denmark’s Harbor Porpoises

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Scienceblog.com 
Harbor porpoises need to eat 2000 fish a day to meet their energy needs. Not because it's demanding to swim, dive and hunt as they are streamlined and very energy efficient. They simply need vast amounts of energy to keep warm in the cold water.
Harbor porpoises need to eat 2000 fish a day to meet their energy needs. Not because it's demanding to swim, dive and hunt as they are streamlined and very energy efficient. They simply need vast amounts of energy to keep warm in the cold water.