06/23/2026
🦀 Horseshoe Crabs Are Returning to Our Shores 🦀
Each spring, horseshoe crabs return to the beaches and tidal waters of southeastern Connecticut to spawn, continuing a migration and breeding cycle that has taken place for hundreds of millions of years, and leaving behind distinctive markings on the sand.
Often called "living fossils," horseshoe crabs have existed on Earth long before dinosaurs. Despite their name, they are more closely related to spiders and scorpions than to true crabs.
Their annual return is an important reminder of the connections that make coastal ecosystems thrive. Horseshoe crab eggs provide food for migrating shorebirds, while healthy estuaries and shorelines provide critical habitat for future generations of horseshoe crabs.
If you're exploring local beaches this season, keep an eye out for these remarkable animals and the shed shells they leave behind as they grow.
Have you spotted a horseshoe crab in the Mystic River watershed this spring?