New Study Reveals How Dinosaur 'Mummies' Preserve Soft Tissues

Paleontologists have long relied on skeletal remains to understand dinosaurs, but the discovery of fossils with preserved soft tissues—often referred to as 'mummies'—has provided unprecedented insights into their external features.

A notable example is the duck-billed dinosaur Edmontosaurus annectens, which lived approximately 68 to 66 million years ago in regions that are now Montana and Saskatchewan. Recent studies of Edmontosaurus mummies have revealed unexpected soft tissue structures, including tough coatings on their back toes resembling hooves or toenails, and a row of overlapping spiky scales running down their backs.

These findings challenge previous assumptions about the conditions necessary for soft tissue preservation. Traditionally, it was believed that rapid burial was essential to prevent decomposition. However, new research suggests that exposure on the surface for weeks to months after death, allowing scavengers and decay processes to create openings in the body, can facilitate the preservation of tougher skin and other soft tissues.

The study of these mummies not only enhances our understanding of dinosaur anatomy but also provides insights into their behavior and ecology. For instance, the hoof-like structures on Edmontosaurus suggest adaptations for specific locomotion or environmental interactions.

As paleontologists continue to investigate these exceptional fossils, they are uncovering more about the diverse pathways through which soft tissue preservation can occur, reshaping our understanding of the fossilization process and the ancient lives of dinosaurs.