A dam is just like a small lake, or pond. Beavers gets in and out by going up the bank/beach.
If you're actually asking about their "lodge", the big pile of branches that they live in - There's a living space that's above water level, and then tunnels that open up underneath the surface of the water. These tunnels are the way in and out of the lodge.
Beavers stop the world from flooding by building dams
yes
Beavers build dams to control the water flow in their environment area, and they also build lodges to live in.
-Rivers -Dams
building houses or dams
beavers make dams
No, they are cats, and cats don't build, but beavers make dams.
they eat grass and use wood from trees to make their dams and their dams are very important to them
He builds a dam.
By dressing up as beavers.
they build dams
No You are thinking of beavers and dams