Hard to believe but that 2,2029 pound bear mentioned above started life as a one-pounder (0.5 kg). The mother keeps the cubs in the den until they reach about 22-33 pounds (10-15 kilograms). The males take 8 -14 years to reach their adult size. Females reach full size around ages 5 and 6. The cubs nurse for about 2/12 years.
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