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There's still the big question what the heck are the polar bears for? It sort of seemed like at the Hydra station cages they were testing their intelligence for some reason. Not sure what that was about. But here's another blurb that could relate to the reproductive issue:

"Polar bears mate in April and May over a one-week period, which is needed to induce ovulation. The fertilized egg then remains in a suspended state until August or September. During these four months, the females eat prodigious amounts of food in preparation for pregnancy, often more than doubling their body weight. When food becomes scarce in August because of ice breakup, they dig a maternity den in a snow drift and enter a dormant state similar to hibernation. In areas where food is available year-round, they may not enter a den until October. Cubs are born in December without awakening the mother. She remains dormant while nursing her cubs until March, when the family emerges from the den."