In May and June, during the full moon at high tide, Horseshoe Crabs crawl out of the ocean and onto the shore to lay eggs. The spawning also corresponds with the Red Knot migration, where Red Knots eat the eggs on their way up north (Though, you're very lucky if you see them).
Little known fact: Delaware is home to the largest concentration of Horseshoe Crabs in the entire world, which makes it the best location to photograph these creatures. Which is exactly what BlueHour & I did!
Though we didn't get to see throngs of crabs wash ashore due to the weather, we did make some strong images. Here are some of my favorite from the weekend.
I did learn a lot over two days. For example, I had no idea these crabs were so important to medical science, and that their blood is the basis for the LAL test to detect bacterial toxins. I did some reading on the Red Knot as well - here is a great article about the migration and its changing patterns if you're interested.
We hope to someday take another trip here to see this with a small group!