Their eyes open at birth. When the second litter is born the first litter moves out. Beavers mature in about 2 to 3 years. Feeding Habits Beavers eat only plants. They eat poplar trees, carrots, cattail, mushrooms, potatoes, berries, water plants, swamp wood, and fruit.
Soft bark is the main food for a beaver.
Swimming Information Beavers can swim underwater for 15 minutes. They can do that because they have very big lungs. Their tails are used as a rudder. If they turn their tail to the right the beaver will go left. Beavers have noses and ears that close when the beaver is in the water.