Hold on to your nose! Harrison decides to do a show about, well, you know. He's visited by a paleontologist who brings million-year-old fossils of dinosaur poop.

The Big Question: "How do flowers poop?" 1) MY GREAT CHALLENGE: Challengers have to pick apart fake animal poop to find bones, berries, and grass, and then guess whether the animal who made the poop was an herbivore, carnivore, or omnivore. 2) IN THE FIELD: Harrison and an animal biologist collect real animal poop in the woods, and then examine it in the lab. P-U!