If beavers are tunneling into the bank, the half moon in the pond bottom is a run, and they hollow out a den in the bank.
If they are piling up sticks and mud in a shallow area, it's a beaver house. They will have runs going into the house.
If you can find the runs, a 330 conibear placed in the run and held upright with a dead stick will get them 99% of the time.
