Mr. Doyle is a naturalist, amateur archaeologist and master flintknapper from the Portland, Maine area. Bob has replicated the prehistoric creation of figure stones in both flint and coarse stone materials. He identified this pebble as a worked artifact, with very subtle removal of stone material to affect the final form of a sleeping duck, or waterbird. The overall shape is similar to a modern duck decoy. The head is at right, with a carved eye cavity. The duck's head is resting on its back, turned toward its rear, with its bill pointing left. The "sleeping duck" is a relatively common prehistoric portable rock art motif seen in Europe and America.