Polar bear moms enter dens in winter, choosing isolated location.s that make dens are notoriously difficult to research. (IMAGE)

University of Toronto

Polar bear moms enter dens in winter, choosing isolated location.s that make dens are notoriously difficult to research.

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Polar bear moms enter dens in winter, choosing isolated locations that make dens are notoriously difficult to research.

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BJ Kirschhoffer, Polar Bears International.

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