In the central portion of the mountain beaver's range, males are in breeding condition from January through March, whereas most females are in estrus during mid-February. Only females two years or older breed and, after a 28- to 30-day gestation period, parturition occurs in the nest chamber from
late March through early April. Only one litter is produced per year and, although females have three pairs of mammae, typically between two to three young are born, though litter size can vary up to six. Young are weaned at 6-8 weeks old and, a week or two later, they leave the nest chamber to begin surface activities.
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