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The breeding season extends from March through August. Muskrats mate while partially submerged or on water-logged debris just above the surface. The gestation period is about 28 days (extremes, 22-30 days). Females bear 1-4 litters of 1-14 (average 6-7) young per litter. Newborn muskrats weigh about 22 g (0.8 oz), are pink, blind, nearly hairless, and have small round tails. They grow rapidly, their eyes opening at 14-16 days, and are weaned at 21-28 days. Most breed as yearlings. The life expectancy for an adult is 3-4 years; potential longevity is about 10 years.

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