Was Triceratops a social animal?

Until now, Triceratops was thought to be unusual among its ceratopsid relatives. While many ceratopsids -a common group of herbivorous dinosaurs that lived toward the end of the Cretaceous -have been found in enormous bonebed deposits of multiple individuals, all known Triceratops (over 50 in total) fossils have been solitary individuals. But a new discovery of a jumble of at least three juveniles the badlands of the north-central United States suggests that the three-horned dinosaurs were not only social animals, but may have exhibited unique gregarious groupings of juveniles.

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