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First Feathers Found in Fossilized Dinosaur Poop

Fossilized dinosaur droppings have yielded the first-ever discovery of preserved feathers, offering insights into the lives and potential extinction causes of ancient birds.

The feathers exhibit dense bristles, potentially for water repellency similar to modern pelicans, and air-filled shafts, a characteristic that provides lightweight yet stiff plumage for flight, a feature previously unseen in the Age of Dinosaurs.

This find may also shed light on why some bird groups survived the mass extinction event 66 million years ago while others, including the group these feathers belong to, did not.

Unearthed in Montana's Hell Creek Formation, the fossilized dung (coprolite) revealed feathers due to a fortunate break on its surface, which allowed one feather to be fully visible.

Micro-CT scans revealed the coprolite's contents, including leg bones and fish scales, suggesting the bird was aquatic, likely a hesperonithiform, and had recently eaten.

While some feathers resembled those of modern birds, others were more primitive and stringy, possibly hindering the bird's ability to maintain body heat.

Poor insulation could be a factor in the extinction of hesperonithiforms during the post-asteroid impact cooling. However, more fossilized feathers from various species of that era are needed to confirm this hypothesis, as such fossils are exceedingly rare.

The discovery highlights that feces can preserve plumage, prompting researchers to actively search for more such evidence.

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