When thinking about the kinds of animals that are legally protected, arachnids probably aren’t the first that come to mind—let alone horseshoe crabs, the giant prehistoric animal that now resides in the Atlantic Ocean along the North American coastline. (Despite their name, they’re more closely related to scorpions than to actual crabs). But like mice and monkeys, horseshoe crabs are used in—and have a complicated relationship with—the medical field. 

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