Deep Sleep - Due to the scarcity of food during the cold winter months, grizzly bears have adopted hibernation to survive. For six months or longer, grizzly bears survive on stored fat reserves built up during the spring and summer. During hibernation, they slightly reduce their body temperature and significantly reduce their heartbeat and respiration rate. Female bears even give birth during the hibernation period using stored fat to provide milk for the cubs as well as sustain the mother until spring.
Digging Tools - Grizzly bears have sharp, curved claws up to five inches long on their front feet that are used for digging up food such as roots and invertebrates, catching fish, tearing apart rotten logs in search of food, or slicing into plant or animal matter. Their claws can come in handy when the bears dig their dens for winter hibernation.
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