Natural Bridges State Beach is a 65-acre (26 ha) California state park in Santa Cruz, California in the United States. The park features a natural bridge across a section of the beach. It is also well known as a hotspot to see monarch butterfly migrations. The Monarch Butterfly Natural Preserve is home to up to 150,000 monarch butterflies from October through early February. The first inhabitants in the Santa Cruz area were small groups of Native Americans. The Ohlone were a semi-nomadic tribe that hunted game and marine mammals and supplemented their diets with shellfish, fish, edible roots and shoots, acorns, nuts, and seeds.