On this bluff lies one of the two great animal effigy mounds built by Ohio's prehistoric people. Shown here, Alligator Mound is a giant earthen sculpture of some four-footed animal with a long, curving tail. Archaeologists believe the animal is perhaps an opossum or a panther, but not an alligator. The earthwork is approximately 250 feet long, seventy-six feet wide, and four feet high. Like the Great Serpent Mound in Adams County, Ohio, Alligator Mound is not a burial mound. The Newark Earthworks, built by the Hopewell people between 100 B.C. and A.D. 400, are three miles to the east. Scholars do not know who built Alligator Mound, but it may be the work of the Hopewell.