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University of Chicago paleontologist Paul Sereno has mapped the look of the duck-billed Edmontosaurus annectens in rare detail, publishing findings in Science after tracking down a century-old mummy site in eastern Wyoming. Archival sleuthing and a tip from a rancher whose great-grandmother was the Warren, Wyoming postmaster led his team to the mummy zone, where river sand preserved skin as fragile clay masks. The specimens, an adult Ed Sr. and late juvenile Ed Jr. (the only juvenile dinosaur mummy, the university says), reveal hooves, a crest, and tail spikes. Experts praised the feet and called the study a baseline.

Prepared by Olivia Bennett and reviewed by editorial team.