The best places to see them include Slaughter Beach, DuPont Nature Center, Kitts Hummock and Pickering Beach, but horseshoe ...

A ruddy turnstone eats a horseshoe crab in Delaware Bay, New Jersey. The animals are vital food sources for ruddy turnstones and other migratory birds. Photograph by Doug Wechsler, Minden Pictures ...

An Atlantic horseshoe crab attempts to flip over on Pickering beach, a national horseshoe crab sanctuary near Little Creek, Delaware. Delaware Bay — For such a resilient species, the horseshoe ...

Mass Audubon's science coordinator Mark Faherty examines a horseshoe crab in Pleasant Bay, where he has conducted research on them for years. John Tlumacki/The Boston Globe via Getty Images If you ...