Add Yahoo as a preferred source to see more of our stories on Google. A group of Emperor penguin chicks is walking on the fast ice at the Emperor penguin colony at Snow Hill Island in the Weddell Sea ...

Picture a frozen colossus drifting silently through icy waters, big enough to blanket London twice over. That's iceberg A23a.

This footage of the penguins taking a surprise dive is a reminder that small events can show bigger problems in fragile places like Antarctica.

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