Amazing fact: Grizzly bear females (sows) have something called delayed implantation. After they mate with a male grizzly, the resulting fertilized embryo waits inside the female until the fall. If the mother has enough fat reserves to be able to sustain a pregnancy, the embryo will implant itself in the wall of her uterus. If she doesn't have enough reserves, the embryo is simply reabsorbed into her system. Because of this delayed implantation, a female grizzly bear can carry more than one cub from more than one father, resulting in cubs from the same litter that don't look like each other. Source: Eastern Slopes Grizzly Bear Project (ESGBP)

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