Scientists studying a fossilized droppings (coprolite) from the Hell Creek Formation in Montana have discovered a remarkably intact feather that may help explain why birds survived the end‑Cretaceous extinction.
Discovery and Analysis
While fieldwork in 2016, paleontologist David DeMar Jr. spotted a dark, reddish‑brown nodule about half the size of a golf ball on a rocky outcrop. “I couldn’t believe what I was seeing—a tiny fossil feather,” he recalled. Subsequent CT scans revealed multiple feathers, tiny fish scales, and leg bones embedded in the coprolite.
Lead author Jingmai O’Connor, associate curator of fossil reptiles at the Field Museum, noted that this is the first time feathers have been examined inside fossilized dinosaur dung. “As far as I know, no one has ever thought to look for feathers or to study feathers in coprolites,” she said.
What the Feather Reveals
The feather likely belonged to a hesperornithiform, an aquatic bird similar to modern loons that could not fly but dove for fish. These birds possessed a mix of primitive, fuzzy body feathers and more modern, water‑proof plumage. O’Connor believes the feather structure offers insight into why the modern bird lineage, Neornithes, survived while other groups, such as enantiornithines and hesperornithiforms, went extinct.
She suggests that differences in feather insulation and molting patterns may have given Neornithes an advantage during the post‑impact “impact winter.” Modern‑looking, waterproof feathers would have helped retain heat, whereas the more primitive feathers of other groups may have been less efficient.
Broader Implications
Co‑author Nate Carroll of the Carter County Museum described the find as a “game changer,” noting that most feather data have come from amber. This coprolite provides a new window into predator‑prey interactions 66 million years ago and expands the sources scientists can use to study ancient avian biology.
Greg Wilson Mantilla of the University of Washington added, “We rarely find fossils of birds and even more rarely their feathers, giving us such important insight into the evolution of this key aspect of their biology.” The team hopes the discovery will encourage more CT scanning of coprolites to uncover hidden details about prehistoric ecosystems.
Original reporting: KTBS 3 (Shreveport) — read the source article.
