English: Datai is a small ankylosaurid dinosaur from the Late Cretaceous of China. Like all ankylosaurs, it was a quadrupedal herbivore, covered in an armor of bony osteoderms down its back and tail. Datai is notable for having double horns on its cheeks, as well as extensive osteoderms on its throat. The preserved specimens were two subadults lying gregariously together, suggesting the possibility that ankylosuars may have sometimes lived in small groups, at least as juveniles.