The Red Knot is a true marathon traveler, flying up to 9,000 miles between the Arctic tundra and Tierra del Fuego. But their journey depends on a critical stopover: Delaware Bay, where they feast on horseshoe crab eggs to refuel. Overharvesting of horseshoe crabs once drastically reduced this essential food supply, but thanks to ongoing protections, Red Knots still have a fighting chance.

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