One day in 2016, paleontologist David DeMar got very lucky. While examining the ground at Hell Creek in the U.S. state of Montana, he found a fossil the size of a golf ball. It was a coprolite — fossilized feces — from a theropod (probably a juvenile Tyrannosaurus rex or a Nanotyrannus). Inside the coprolite was a feather from an aquatic bird (not related to modern birds). With a high degree of confidence, researchers believe the bird spent the final moments of its life in the digestive tract of a teenage T. rex.

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