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  Twin polar bear cubs, about three months old, inside a snow den.

  Polar bear maternity denning area, Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

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  A polar bear mother and her two-year-old cub travel together on the sea ice at sunset.

  Western Hudson Bay, Manitoba, Canada.

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  A polar bear mother and her twin two-year-old cubs resting on a floe of sea ice in heavy fog at twilight.

  Arctic Ocean above 81-degrees North.

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  Twin polar bear cubs, about three months old, inside a snow den.

  Polar bear maternity denning area, Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

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  An adult female polar bear and her triplets (about 2 years old) travel and hunt on the sea ice.

  It is very uncommon for all three triplets to survive to this age. Triplet litters are becoming increasingly rare because of the effects of climate change on adult female polar bears. Hudson Bay, Manitoba, Canada.

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  A mother polar bear and her twin cubs (about 6 months old) at the edge of sea ice in a fjord.

  Northern Nordaustlandet, Svalbard Archipelago, Arctic Ocean, Norway.

• Young twin polar bear cubs mimic their mother's seal-hunting behavior as they play in the snow.

  Hudson Bay, Manitoba, Canada.

• Young twin polar bear cubs mimic their mother's seal-hunting behavior as they play in the snow.

  Hudson Bay, Manitoba, Canada.

• Young twin polar bear cubs mimic their mother's seal-hunting behavior as they play in the snow.

  Hudson Bay, Manitoba, Canada.

• A mother polar bear and her twin cubs (about 6 months old) at the edge of sea ice in a fjord.

  Northern Nordaustlandet, Svalbard Archipelago, Arctic Ocean, Norway.

• Polar bear mother and twin cubs in a snowstorm.

  Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

• A polar bear mother and her twin cubs traveling together on the sea ice.

  Hudson Bay, Manitoba, Canada.

• Polar bear mother sheltering her twin cubs during a snowstorm.

  Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

• Polar bear mother sheltering her twin cubs during a snowstorm.

  Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

• Polar bear mother and twin cubs sleeping curled closely together during a snowstorm.

  Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

• A polar bear mother and her cub travel together on the sea ice.

  Hudson Bay, Manitoba, Canada.

• An adult female polar bear, followed by her twin two-year-old cubs, lunges violently toward an adult male who was following the family on the sea ice. Intimidated by her aggression, the male retreated.

  Western Hudson Bay, Manitoba, Canada.

• A polar bear mother and her twin two-year-old cubs resting on a floe of sea ice in heavy fog at twilight.

  Arctic Ocean above 81-degrees North.

• Twin polar bear cubs, about three months old, inside a snow den.

  Polar bear maternity denning area, Wapusk National Park, Western Hudson Bay, Manitoba, Canada.

• Young polar bear cub, about 3-4 months old, sleeping with her head resting on her mother.

  Polar bear maternity denning area, Wapusk National Park, Western Hudson Bay, Manitoba, Canada.