Horseshoe crabs have been around since before the age of dinosaurs! During the time, they've seen a lot of changes in the world. We talk about these living fossils, including why their blood is so valuable, their many eyes and legs, and many other cool facts. 

If you think you know the answer to the riddle or creature quiz, or if you do the Kid Power challenge, send us an email at [email protected] or tweet us at @coolanimalspod and we'll send you a bookmark! 

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Thanks to Andrew of Ear Snacks for our theme song!