For years, scientists believed that early four-legged creatures started their lives as tadpoles, living in water before transforming into adults on land. But a recent study challenges this idea by focusing on embolomers, large aquatic predators from over 300 million years ago. These ancient beasts may have made the leap straight from water to land without ever going through a tadpole phase.

Research associate Jason Pardo and his team from the Field Museum examined baby embolomers, finding evidence that these early tetrapods were adapted for both aquatic and terrestrial environments from birth. This suggests our assumptions about their life cycle might be outdated.

The discovery is significant because it forces a reevaluation of how ancient vertebrates transitioned from water to land. ‘It’s easier to make the transition if you’re already making that transition as part of your life cycle,’ Pardo noted, though this may not have been the case for our earliest tetrapod ancestors.

The study on embolomers opens up new questions about early evolution and how animals adapted to different environments. It could also shed light on how modern amphibians might differ from their ancient predecessors in life cycle development.