Whose scat is that? In this case, it belonged to a Tyrannosaurus rex.

Along Route 66 near Williams, Arizona, you might spot a strange sign. It shows a cartoon T. rex sitting on a toilet. It’s the sign for the Poozeum—a museum of fossilized animal droppings.

Don’t worry. You won’t find any stinky smells or germs. That yucky stuff faded thousands of years ago. The ancient excrement has turned into stone. That’s called fossilization.

You’ve probably heard of animal fossils. But feces fossils? They’re not as common. These ancient droppings have a scientific name. They’re called coprolites.

George Frandsen started the museum. He bought his first coprolite at 18 years old. He already loved dinosaurs and fossils. But he’d never heard of fossilized feces! From there, his fascination grew.

“It was funny. It was gross,” says Mr. Frandsen. “But I learned very quickly it could tell us so much.”

What can we learn from coprolites? They can teach us about dinosaur digestion. Fossilized T. rex droppings contain bits of bone. That shows that T. rex wasn’t much of a chewer—despite the huge teeth!

You can’t always tell which dino left a coprolite behind. But you can often figure out whether it ate plants or meat. That helps experts learn about dino diets.

Mr. Frandsen holds two Guinness World Records. His museum houses the largest coprolite from a carnivorous (meat-eating) animal. It’s more than two feet long! In 2015, he also earned the record for world’s largest coprolite collection. Back then, he owned just 1,277 specimens. Now he has about 8,000!

Feces fossils might seem gross or silly. But nature tells us about the amazing things God created. When we learn about those creations, we can learn about their Creator.

For by Him all things were created, in heaven and on Earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through Him and for Him. — Colossians 1:16