Ingo Arndt / Rear view of Horseshoe crab (Limulus polyphemus) with trail in sand, Delaware Bay, Delaware, USA, May
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Doug Wechsler / Horseshoe crab (Limulus polyphemus) embryos, Delaware Bay, New Jersey, USA, June.
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Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey
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Sean Crane / Horseshoe Crab (Limulus polyphemus) group spawning at high tide at sunset, Cape May, New Jersey
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Steve Nicholls / Horseshoe crabs (Limulus polyphemus) spawning at low tide, Slaughter Beach, Delaware, USA, May
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Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey
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Fred Bavendam / Horseshoe Crab (Limulus polyphemus) group crawling ashore on the high tides of spring to lay their eggs in Delaware Bay's sandy beaches, New Jersey
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Fred Bavendam / Horseshoe Crab (Limulus polyphemus) eggs almost ready to hatch after two weeks incubation in the warm sands of Cape Anne, Massachusetts
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Piotr Naskrecki / Horseshoe Crab (Limulus polyphemus) gathering on beach to lay eggs, seen under UV light, Delaware National Estuarine Research Reserve, Delaware
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Alex Mustard / Toddler watching a pair of Horseshoe crabs (Limulus polyphemus) spawning in shallow water. Larger female and smaller male. Indian River, North Atlantic Ocean. Titusville, Merrit Island, Florida, USA....
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Alex Mustard / Horseshoe crab (Limulus polyphemus) pair, larger female and smaller male, spawning in shallow water. Indian River, North Atlantic Ocean. Titusville, Merrit Island, Florida, USA. February.
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Doug Wechsler / Horseshoe crabs (Limulus polyphemus) on beach mating, with Ruddy turnstone (Arenaria interpres) and Red knot (Calidris canuta) on beach, Delaware Bay, New Jersey, May.