Read MoreOnce believed to be extinct, the ancient mammal has started to make a comeback, but the risks remain grave.Once believed to be extinct, the ancient mammal has started to make a comeback, but the risks remain grave.

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Read MoreOnce believed to be extinct, the ancient mammal has started to make a comeback, but the risks remain grave.Once believed to be extinct, the ancient mammal has started to make a comeback, but the risks remain grave.