Originally Posted By: Tums
Looks like beav is checking out the PVC pipe to me. Is there water flowing thru it or is one end stuck into the pond where a water noise would travel up the pipe?

The water is turned off until the weather warms up. And they don;t have any openings in the water. I did look closely at the pipes in both places, and can find no damage to them. They are two-inch PVC with pretty thick walls.