Learn about this ancient animal that has been around for 450 Million years and today is important in saving human lives. During the full moon in May (May 26) Horseshoe crabs come into shallow water to mate and lay their eggs. The Caumsett salt marsh is a breeding area for these fascinating creatures and we can see, touch, feel, and learn as we explore the marsh at low tide. We may even be lucky enough to find their eggs as we explore the tidal sand bars. Please wear old clothes and sneakers or water shoes that can get wet.