Pretty sure I read that they will take over a beaver lodge.
On Kawnippi I paddled by one of those rock overhangs low to the water, the ones that go blurp blurp with the waves. I was curious how all the sticks n'at got caught up in it. On the next pass I saw an otter swim to the entrance. I paddled over and could hear lots of activity inside. The sticks weren't skinned so I assumed the otters must have at least made an attempt to secure the entrance.