The new dinosaurs are members of the ceratopsids, the group of dinosaurs that includes Triceratops. The animals were generally four-legged herbivores with horns and bony frills rising from the backs of their heads.

The larger of the two dinosaurs, Utahceratops gettyi, had a 7-foot-long (2.3-meter-long) skull, prompting study co-author Mark Loewen of the University of Utah to compare the animal to "a giant rhino with a ridiculously supersized head."

(Also see "Huge New Dinosaur Found via 'Mind-boggling' Skulls.")

The other new dinosaur, Kosmoceratops richardsoni, is "one of the most amazing animals known, with a huge skull decorated with an assortment of bony bells and whistles," study leader