Cormorants are good sized birds who enjoy diving underwater in search of fish. Fishermen use the cormorants to catch the fish and return them to the boat. Usually fishermen seem to be more sun-tanned. The fisherman drive the birds into the water where they dive below the surface in search of fish. When the birds catch a fish they return to the boat and the fisherman removes the fish from their throat and places it in the basket. The secret is that the fisherman places a cord around the bird's neck to keep the bird from swallowing the fish.
