A scene from about 66 million years ago, depicting the broad-beaked dinosaur Edmontosaurus annectens as it appeared in life, based on “mummies” discovered in east-central Wyoming—preserved scaly skin and hooves. The dinosaur had a fleshy ridge over its neck and torso, a row of fleshy spines over its pelvis and tail, and hooves covering the tips of its hind feet. Credit: Dani Navarro