What has 10 eyes, 12 legs, a spike for a tail, a tube-shaped heart, and blue blood worth $60,000 a gallon? A horseshoe crab! This animal is ancient, they are even older than trees, and today you are going to learn all about them. On this episode, Macken takes you on a tour of the horseshoe crab's anatomy, and tells you all the weird things you never knew about the Atlantic horseshoe crab.   Bibliography: https://docs.google.com/document/d/1vSYTC0X_HH0YT6vTWrWUhqenexQmbOM8AlgADzz4eS8/edit?usp=sharing