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Migrating horseshoe crabs that have been coming to the Delaware Bay to spawn for millions of years.
https://www.nature.org/en-us/about-us/where-we-work/united-states/delaware/stories-in-delaware/delaware-horseshoe-crab-count/#:~:text=Horseshoe%20Crabs%3A%20Living%20Dinosaurs%20Converge%20on%20Delaware%20Bay&text=On%20moonlit%20nights%20in%20May,road%20paved%20with%20brown%20shells.