Some species are endangered and many are protected due to overharvesting in the past. Not to mention they’re crustaceans. If you ever broke a crabs arm while it is alive you will see a lot of goop come out. Horseshoe crabs have very little blood to begin with (there is only 7-8 quarts in a human and think of the size difference) and you would need some kind of centrifuge to separate the liquids and get blood without other matter in it (idk what they’d use) . Not to mention you only really find a lot of them on shore lines around brackish water salt water. I found tons and tons of them on the shores in Maryland but never on any other beaches.
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