From Ohio History Central
Alligator Mound is an effigy mound located in Granville. The mound is 200 feet long and five to six feet high at its highest point. It is located on the top of a bluff overlooking the Raccoon Creek valley.
In spite of its name, the mound likely was not intended to represent an alligator. It is in the shape of a four-footed creature with a round head and a long tail that curls at the end. It resembles an opossum or a panther much more than an alligator. It may represent the Underwater Panther, a supernatural creature thought by many American Indian tribes to reside in lakes and other bodies of water.