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They are generally slightly smaller and, unlike solely land breeding seals found in the British Isles, can give birth to young on both drift ice and on land.

Officials said they believe the killer whales were able to free themselves from the drift ice as gaps between them grew.

A pod of around a dozen killer whales trapped by drift ice in waters off Japan's northern island appear to have successfully escaped, officials say.

A pod of killer whales appear to have become stuck in drift ice off the coast of Japan.

A railway bridge the Soviets built over the strait at the end of World War II was swept away by drift ice a few months after the first train crossed.