Polar bear Kai at an enclosure in the Novosibirsk Zoo with his cub born on December 11, 2013.

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Polar bear Gerda at an enclosure in the Novosibirsk Zoo with her cub born on December 11, 2013.

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Polar bear Gerda at an enclosure in the Novosibirsk Zoo with her cub born on December 11, 2013.

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Polar bear Gerda at an enclosure in the Novosibirsk Zoo with her cub born on December 11, 2013.

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Polar bear Gerda at an enclosure in the Novosibirsk Zoo with her cub born on December 11, 2013.

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Polar bear Gerda at an enclosure in the Novosibirsk Zoo with her cub born on December 11, 2013.

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Polar bear Kai at an enclosure in the Novosibirsk Zoo. He and polar bear Gerda had their cub born on December 11, 2013.

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Polar bear Kai at an enclosure in the Novosibirsk Zoo. He and polar bear Gerda had their cub born on December 11, 2013.

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Polar bear Kai at an enclosure in the Novosibirsk Zoo. He and polar bear Gerda had their cub born on December 11, 2013.

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