Sixty-six million years ago, a bird was eaten by a dinosaur — and that small, violent moment was preserved long enough for us to find it. A feather recovered from fossilized dinosaur feces, dated to the very edge of the Cretaceous extinction, offers scientists something rare: physical proof that birds and their non-avian relatives shared the same world in its final hours. It is a fragment no larger than a fingernail, yet it anchors one of evolution's most consequential mysteries — how birds alone among the dinosaurs inherited the Earth — in something we can hold and study rather than merely th