How Beavers Turn a Stream into a Pond
A beaver wants a safe home surrounded by water. Where a stream runs too shallow, a beaver builds its own pond.
First, beavers cut down small trees with their strong front teeth. They drag the logs and branches to the stream. They lay the sticks across the water, and they push mud and stones into the gaps. This wall is called a dam.
The dam slows the water down. Behind it, the water spreads out over low ground and a pond forms. Now the beavers can build a lodge, which is a dome of sticks and mud. The doorway is under the water, so most animals cannot get in.
The pond helps other animals too. Ducks swim on it, and frogs lay eggs at its edge. Many insects live there, and birds come to eat them.
Beavers keep fixing their dam, because moving water always pushes against it.