Yawning polar bear on sub-arctic tundra grassland north of Churchill in Manitoba, Canada

Yawning polar bear (Ursus maritimus) on sub-arctic tundra grassland north of Churchill in Manitoba, Canada.

Yawning polar bear (Ursus maritimus) on sub-arctic tundra grassland north of Churchill in Manitoba, Canada.

Yawning polar bear (Ursus maritimus) on sub-arctic tundra grassland north of Churchill in Manitoba, Canada.

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