An artist's reconstruction of a Mussaurus patagonicus nest. Jorge Gonzalez Paleontologists found 100 eggs and 80 skeletons from a dinosaur called Mussaurus at a nesting ground in Patagonia. The fossils were grouped into clusters of adults and juveniles, suggesting Mussaurus lived in herds. The nesting ground is 193 million years old, making it the earliest evidence of dinosaur herds. A 193-million-year-old nesting ground containing more than 100 dinosaurs eggs is upending paleontologists' understanding of an early dinosaur species.Research published Thursday describes a collection of eggs and juvenile and adult skeletons from a dinosaur called Mussaurus patagonicus, which were found in Patagonia, Argentina.