mammals

A Fossil Discovery Reveals the Earliest Relative of Modern Mammals

A Fossil Discovery Reveals the Earliest Relative of Modern Mammals

Over 300 million years ago, our ancestors diverged from the ancestors of reptiles and began the evolutionary journey towards becoming mammals. What were these earliest ancestors like? For one, they looked nothing like modern mammals. The group known as synapsids — described as “mammal-like reptiles” — looked much more like…