Building dams create reservoirs where fish and water birds can live. Thr dams also keep river silt from flooding the forests. Beavers are known to mate for life. When they have babies, the babies stay in the den with the mother until the next set of babies is born. Up to three generations may live together in a den.
Beavers mate in the water.
The mother will be pregnant for about three and a half months. The babies can swim almost immediately. Mothers have been seen carrying their young in their arms and walking on their hind legs. Some babies will catch a ride on the mother's tail. Beavers live on average of 10 - 15 years.