There are only four living species of horseshoe crabs, and ours is the only species native to the Atlantic Ocean. The other three species can be found in the Indian and Pacific Oceans.
Female horseshoe crab are about one-third larger than the males. They can grow to be 18 to 19 inches (46 to 48 centimeters) from head to tail, while the males are approximately 14 to 15 inches (36 to 38 centimeters).
Visit Adventure Aquarium’s KidZone to learn more about these common beach dwellers! Horseshoe crabs are comprised of a hard shelled body with two large compound eyes and multiple smaller simple ones atop the carapace.