Another good way to do this is to buy a stick of 12 inch (diameter) PVC pipe. Cut it into 3 foot lenghts. Stand the pipes up in the yard and put about 4 inches of concrete in the bottom of each, closing one end. Then take the pieces, and stack them in a pyramid shape with the closed ends facing alternating directions. Bolt, wire, tie, screw, them together in the pyramid shape and toss it into your pond. If you tied together 5 pipes, you just made 5 nests.
