The Coastal Discovery Museum at 70 Honey Horn Dr. will present “Horseshoe Crabs: Living Fossils” at 5:30 p.m. on April 20-21. During this one-hour program, guests will discover the importance of this living fossil and how their blue blood protects humans, see live juvenile horseshoe crabs and explore the horseshoe crab’s life cycle. After this indoor presentation, guests will be provided with information about where they can find spawning horseshoe crabs. They can begin their quest to find horseshoe crabs spawning just hours after the presentation. Reservations required. $7 per person. For more information or to make reservations, call the Coastal Discovery Museum at (843) 689-6767 ext. 223 or click here to visit their website.