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Recent whale strandings highlight the mystery that still baffles marine scientists

A photo released by the New Zealand Department of Conservation on April 5, 2018, shows beached pilot whales in Haast, a city on the west coast of New Zealand's South Island. (AP)
A photo released by the New Zealand Department of Conservation on April 5, 2018, shows beached pilot whales in Haast, a city on the west coast of New Zealand's South Island. (AP)

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