Archaeological finds at Anderson Marsh State Historic Park have revealed evidence of human settlement dating back 10,000 years. The area’s oldest inhabitants are believed to have been hunter-gatherer groups who predated the area’s better-known Porno Indians by some 5,000 years. Displays at the site document the ancient finds, though much of the park is a wildlife refuge, bestowing protection on the scores of bird species – bald eagles among them – which thrive on the marshlands that denote the southern reaches of Clear Lake.