Delayed gestation or delayed implantation is a natural adaptation of the polar bear to its harsh arctic environment. This assures that the cub is born during the best time of the year for survival and allows the female to achieve optimal physical condition and to use her energy for nursing her newborn cubs.
In a metaphorical stretch of sorts, I can imagine unsuitable conditions due to global warming that basically put all future developments into a state of permanent delay. Not my most uplifting post, but there you go...let's not let that happen!
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