Which of these animals build dams?

Kendell gray will tell you it. Look him up on YouTube. He’s funny.

Once, as we walked along a small stream where beavers had built a dam, one of them slapped its tail on the surface of the water as a warning to its companions. Quite a loud noise. (This was in New England in the US.)

a pic for them would be better

I never knew this! Amazing!

import beavers to the nation