Isotope analysis of the teeth confirm this assumed terrestrial way of life. In the case of  Numidotherium  compared to Barytherium or Moeritherium, these resulted in more fluctuating ratios of the oxygen isotope O18, which in the latter two are significantly more balanced due to their semi-aquatic way of life.
Isotope analysis of teeth provides evidence for a terrestrial lifestyle in Numidotherium compared to Barytherium or Moeritherium, which have more balanced oxygen isotope ratios due to their semi-aquatic habits.