New research confirms the existence of intraspecific fighting in Triceratops horridus, a species of horned dinosaur that lived in North America some 69 million years ago (Cretaceous period). The complete restored skeleton of the Triceratops horridus Big John; the fenestra analyzed by D’Anastasio et al. is indicated by the white circle. Image credit: A. Ferrara / I. Briano / D’Anastasio et al., doi: 10.1038/s41598-022-08033-2. Triceratops horridus...
