06/20/2026
Happy International Horseshoe Crab Day!
Each spring, horseshoe crabs come ashore to spawn, with females laying thousands of eggs that provide a critical food source for migratory shorebirds like the red knot. These ancient creatures are also full of surprises! They have 10 eyes, blue blood that helps scientists ensure the safety of vaccines and medical equipment, and they're actually more closely related to spiders and scorpions than to crabs!
At the Center for the Inland Bays, horseshoe crabs are an important part of our education and conservation efforts. Through our Horseshoe Crab Survey Program, volunteers help monitor spawning activity along local beaches, providing valuable data that supports research of this iconic species. We also incorporate horseshoe crabs into educational programs throughout the year, helping community members of all ages learn about their fascinating biology and the critical role they play in our coastal ecosystem.
Pic 4 📸: John Hoyt