| 1. | Met-sized horseshoe crabs and sand dollars to see if anyone was home.
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| 2. | Visitors can see and touch sea stars, sea cucumbers, and horseshoe crabs.
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| 3. | And those horseshoe crabs-- they look like they're 40 million years old.
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| 4. | Cape Cod settlers once used ground-up horseshoe crabs as fertilizer for their farms.
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| 5. | On the best nights, hundreds of horseshoe crabs will pile on the beach.
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| 6. | It is also present in early fossil representatives of horseshoe crabs.
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| 7. | The medical industry also uses horseshoe crab blood for certain tests.
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| 8. | Since its inception, the ERDG has made significant contributions to horseshoe crab conservation.
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| 9. | The blood of horseshoe crabs contains one type of blood cell, the amebocytes.
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| 10. | "' Tachyplesin "'is an antimicrobial peptide isolated from the horseshoe crab.
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