Female Polar Bears Need an Extra 220 Lbs. for Pregnancy

During seal hunting season, a female polar bear strives to put on up to 300 pounds of fat. That weight gain is a necessity - without it, her body won't allow her to get pregnant.

From the Series: Polar Bear Town: The Big Exodus http://bit.ly/2zXqtbm

Source: Smithsonian Channel, https://www.youtube.com/watch?v=ZI3iBj9Ft1c
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