Adult Archeotherium had huge temporalis muscles, but they were normal-sized in juveniles and only developed as the animal matured. This suggests the expanded cheekbones and extreme jaw strength of the genus may have been involved in adult social behavior more than eating. It is also possible that younger animals had softer diets, or Archaeotherium had significant parental care.
Adult Archeotherium displayed notable temporalis muscles, but these were typical in juveniles and increased as the animal matured. This implies that the distinctive cheekbones and powerful jaws of the genus may have been more crucial for adult social behavior than nutrition. It is also possible that younger animals had softer diets or received substantial parental care.