Reproduction: Mating season is May-August. Females breed every 2-3 years and give birth to 1-3 cubs in their winter den in January or February. Cubs weigh 1lb. at birth but can weigh as much as 165lbs. (if good food sources are available) by their first fall. Cubs stay with their mother for about 2 years. Females often have their cubs when they are about 6 years old.