A new analysis of a beaver anklebone fossil found in Montana suggests the evolution of semi-aquatic beavers may have occurred in North America at least 7 million years earlier than previously thought. EEOB Assistant professor, Jonathan Calede, describes the find as the oldest known amphibious beaver in the world and the oldest amphibious rodent in North America. He named the newly discovered species Microtheriomys articulaquaticus.

Read the full story on the Ohio State News website.

Read the journal article on the Royal Society publishing site.