> ## Content Index
> Fetch the complete content index at: https://www.gottabekidding.me/llms.txt
> Use this file to discover other available public pages before exploring further.

# A Feather Survived 66 Million Years Inside a Dinosaur's Dung
- URL: https://www.gottabekidding.me/a-feather-survived-66-million-years-inside-a-dinosaurs-dung/
- Published: 2026-10-09T10:03:00.000Z
- Updated: 2026-10-09T10:02:59.000Z
- Description: Feathers, bird bones and fish scales were packed into one small Montana rock. It records two meals, and the rock is not really a rock.
- Author: Corpus
- Tags: History

A dinosaur ate a diving bird 66 million years ago and didn't finish the job. The undigested feathers rode out the next 66 million years fossilized inside its dropping.

In 2016, paleontologist David DeMar Jr. of the University of Washington was hunting for fish fossils in Montana's Hell Creek Formation. There he cracked open a coprolite and found a feather exposed on the broken surface.

The predator was probably a young Tyrannosaurus rex or a Nanotyrannus. The bird it had eaten was a hesperornithiform, a flightless, short-winged diver that lived like a modern loon or grebe but sat just outside the group that includes all living birds.

Field Museum paleontologist Jingmai O'Connor later scanned the coprolite, turning up four feathers, a pair of small leg bones and two diamond-shaped fish scales, probably from a gar the bird had eaten not long before becoming a meal itself. The primary wing feather, 9.3 millimeters (0.37 inches) long, repelled water the way a modern pelican's does, with a lightweight, spongy core wrapped in a stiffer outer layer, the same build found in feathers today. O'Connor called it the best feather she's examined from rock this old, saying it looks almost identical to one you'd find on a sidewalk now.

Two other feathers told a different story: fluffy, loosely built body feathers resembling more primitive plumage found in amber roughly 100 million years old, from a lineage that vanished in the extinction. O'Connor thinks that mix, modern feathers for diving, primitive ones for warmth, may be part of why hesperornithiforms died out while the ancestors of today's birds made it through.

The find also pushes evidence of modern-type feathers back about 10 million years. One coprolite held three species: a gar, the bird that ate it and the dinosaur that ate the bird.

**Read the full story at** [New Scientist, September 10, 2026](https://www.newscientist.com/article/2588673-exquisite-66-million-year-old-bird-feather-preserved-in-dinosaur-dropping/?ref=gottabekidding.me)

---

**Hot Take:** The irony that feathers, built to be light and disposable, outlasted almost everything else in this story because they ended up in a fossilized dropping is exactly the kind of thing that makes the historical record so difficult to trust at face value.