This school of thought suggests Mesmbriornis may have lived akin to a modern-day cheetah, eating the smaller notoungulate mammals of the time (Miocene) using its speed to outrun the beasts.
This school of thought implies Mesmbriornis may have existed similarly to a modern-day cheetah, exploiting its speed to hunt and outcompete smaller notoungulate mammals during the Miocene epoch.