A true blue blood.

A true blue blood.

Who is a true blue blood, someone (in this case, something) who is noble and great?

Well, a horseshoe crab is! Other than actually having blue blood, these animals are pretty darn noble; existing for so long, having a unique physiology, and providing a service to man-kind.

Read more to learn about what makes the horseshoe crab a "true blue-blood" animal!

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