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This photo provided by Grzegorz Niedzwiedzki shows fossilized poop from an archosaur, a meat-eating reptile, seen in Uppsala, Sweden, on Nov. 7, 2024. (Grzegorz Niedzwiedzki via AP)

This photo provided by Grzegorz Niedzwiedzki shows fossilized poop from an archosaur, a meat-eating reptile, seen in Uppsala, Sweden, on Nov. 7, 2024. (Grzegorz Niedzwiedzki via AP)

This illustration provided by Marcin Ambrozik shows plant-eating dinosaurs in Poland during the Early Jurassic period. (Marcin Ambrozik via AP)

This illustration provided by Marcin Ambrozik shows plant-eating dinosaurs in Poland during the Early Jurassic period. (Marcin Ambrozik via AP)

This undated photo provided by Grzegorz Niedzwiedzki shows fossilized plant-eating dinosaur poop found in Soltykow, Poland. (Grzegorz Niedzwiedzki via AP)

This undated photo provided by Grzegorz Niedzwiedzki shows fossilized plant-eating dinosaur poop found in Soltykow, Poland. (Grzegorz Niedzwiedzki via AP)

This undated photo provided by Grzegorz Niedzwiedzki shows fossilized plant-eating dinosaur poop found in the Holy Cross Mountains, Poland. (Grzegorz Niedzwiedzki via AP)

This undated photo provided by Grzegorz Niedzwiedzki shows fossilized plant-eating dinosaur poop found in the Holy Cross Mountains, Poland. (Grzegorz Niedzwiedzki via AP)