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The complex social behaviour observed in this research lines up with other fossil evidence.

Fossils found in an ancient nesting ground reveals that herd mentality is almost 200 million years old

Findings from new research on a vast fossil site in Patagonia suggest that some of the earliest dinosaurs lived in herds and that this behaviour may have been central to the dinosaurs' success. A significant part of the findings was based on the discovery of embryos of the same species inside fossilized eggs. These findings were reported in the journal Scientific Reports.

A Jurassic graveyard at the Laguna Colorada Formation in Patagonia, Argentina, with numerous bones and more than a hundred fossilized eggs has revealed the earliest evidence of dinosaurs living in herds. In fact, the bones belonged to 80 Mussaurus patagonicus, a group of long-necked herbivorous sauropodomorph dinosaurs. The large amount of eggs and bones –... Read more »

Group of scientists had discovered 190-million-year-old dinosaurs breeding site in Patagonia, during the early 2000s, which included juvenile bones of Mussaurus

Paleontologists found 100 eggs and 80 skeletons from a dinosaur called Mussaurus at a site in Patagonia, suggesting the animals lived in groups.

Patagonian fossils show Jurassic dinosaur had the herd mentality

Patagonian fossils show Jurassic dinosaur had herd mentality

Complete skeletons also indicate limited transport by water or wind from the place the dinosaurs died.The complex social behaviour in early dinosaurs observed in this research lines up with other fossil evidence that dinosaurs were more bird-like than crocodilian-like.

A vast trove of fossils unearthed in Argentina's southern Patagonia region is offering the oldest-known evidence that some dinosaurs thrived in a complex and well-organized herd structure, with adults caring for the young and sharing a communal nesting ground.