Some dinosaurs may have lived in herds as early as 193 million years ago
Fossils of long-necked Mussaurus suggest that the creatures stayed together through their lives
![illustration of nine dinosaurs of differing ages](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/10/101921_CG_dino-herd_feat.jpg?fit=1030%2C580&ssl=1)
A herd of Mussaurus patagonicus, including hatchlings in nests, a group of juveniles and fully grown adults, are gathered together in this artist’s representation.
Jorge Gonzalez