The average adult beaver weighs about 35 pounds but some can get as big as 90 pounds. Some extinct beavers were almost bearlike in size. Beavers are usually about 30 inches long. They are about 12 inches wide. The tail is about 10 inches long.
Females have one litter a year.
The litter is usually 2 to 4 babies. The number of beaver families in a beaver community is rather large. The beavers lodge is built on an island. This lodge consists of a central chamber. Its floor is a little above the level of the water.