Scientists have identified Tyrannoroter heberti, a football-sized creature from 307 million years ago, as one of Earth's earliest known plant-eating land vertebrates. The discovery, published in a recent study, challenges previous assumptions about when herbivory emerged among terrestrial animals.

After analyzing the fossilized skull using CT scans, researchers found multiple rows of specialized conical teeth adapted for crushing and grinding tough plant material. The wear patterns on these teeth, including broad molars covering the roof of the mouth, indicate Tyrannoroter processed vegetation similarly to modern herbivores.

This reptile-like tetrapod, which lived during the Late Carboniferous period when giant ferns flourished, represents a pivotal moment in evolutionary history. The findings suggest herbivory independently evolved multiple times among early land vertebrates, occurring much earlier than previously thought. The creature's name, meaning 'tyrant ploughman,' references its distinctive flat snout likely used for burrowing through vegetation.