But the new fossils, belonging to the herbivore Mussaurus patagonicus, date back to 193 million years ago, indicating that herding behaviour was apparent in the animals much earlier than thought.
While it is known that some species of dinosaurs moved in herds, the behaviour is thought to have started to occur only about 150 million years ago. The discovery of more than 100 fossilised eggs and skeletons of 80 individual dinosaurs, ranging from embryos to fully grown adults, within trenches dug by the animals themselves show clustering in socially cohesive groups by age and resting behaviour. Bengaluru: Paleontologists have unearthed the earliest evidence of dinosaurs living in herds and socialising by age groups at a site in Argentina, South America.
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