Each spring in the global north, brown bears around the world emerge from their dens with new cubs. The cubs come into the world hapless and fragile. Their fathers are long gone; bear mothers must find a way to raise the cubs while surviving themselves.
Female bears generally spend either 1.5 or 2.5 years with their young. In many ways, the pressures of bear life favor the shorter option — a mother with cubs cannot mate, so the more time she spends with each litter, the fewer offspring she'll have over her lifetime.