8 captivating photos of Delaware Bay’s annual horseshoe crab spawn
The ancient relationship between the ancient arthropods and shorebirds drives a 9,000-mile journey.
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Environment Animals Wildlife 8 captivating photos of Delaware Bay’s annual horseshoe crab spawn The ancient relationship between the ancient arthropods and shorebirds drives a 9,000-mile journey. By Avery Schluyer Nunn Published Jun 13, 2026 8:00 AM EDT Add Popular Science (opens in a new tab) More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Horseshoe crabs exhibit biofluorescence under ultraviolet (UV) light. Image: Susan Allen/ @what.sue.seas Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week.
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