Caption:
20040908 - Canada - Alberta : Royal Tyrrell Museum Brontottheres Mating combats probably occurred among ancient mammals, just as they do among bighorn sheep and dison today. Here,two male orontotheres are shown in combat, using their large horns as weapons. Damaged ribs found on some specimens are likely the result of such combats. Brontops Cypress hills formation, Saskatchewan Brontops reotoration Caption word by Royal Tyrrell Museum