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A Fossil Feather From the Age of Dinosaurs May Explain Why only some Birds Survived

Researchers say the feather’s mix of diving traits and poor insulation may help explain why some bird lineages survived the mass extinction.

  • In 2016, Burke Museum lab manager David DeMar discovered a fossilized feather preserved inside a dinosaur coprolite in Montana's Hell Creek Formation, marking a rare find after 150 years of searching.
  • When an asteroid struck Earth 66 million years ago, it triggered mass extinction that killed most dinosaurs and early bird lineages, though one group—the ancestors of modern birds—survived the catastrophe.
  • Field Museum associate curator Jingmai O'Connor identified the feather as belonging to a hesperornithiform, an aquatic, flightless bird that possessed modern-looking, waterproof feathers alongside primitive, fuzzy down typical of dinosaurs.
  • O'Connor suggests advanced plumage gave Neornithes the insulation needed to survive the post-impact winter, while hesperornithiforms' primitive feathers provided insufficient protection, contributing to their extinction alongside non-surviving dinosaur groups.
  • Researchers now view coprolites as an untapped window for studying fossilized soft tissues, potentially revealing fur and skin structures that skeletal remains alone cannot preserve, reshaping how paleontologists understand evolutionary history.
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(Seoul = Yonhap News) Reporter Lee Joo-young = How did birds survive when dinosaurs went extinct due to an asteroid impact 66 million years ago? A dinosaur poop fossil (coprol...

·Seoul, Korea (the Republic of)
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npr broke the news in Washington, United States on Thursday, September 10, 2026.
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