"Icebergs have grounded there in the past and that has caused significant mortality to penguin chicks and seal pups," he said. Roughly 1,550 square miles across, the world's biggest and oldest ...

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"Icebergs have grounded there in the past and that has caused significant mortality to penguin chicks and seal pups," he said. Roughly 3,500 square kilometers (1,350 square miles) across ...