Queretaro discovery: New study with fossils from the Bajío reveals that Mexico was key to the diversification of mammals in America

A new paleontological study conducted in the Bajío region of Querétaro, Mexico, provides evidence that the area played a central role in the diversification of mammals across the Americas. The findings challenge long-standing scientific consensus regarding the Great American Biotic Interchange, which previously suggested that the mass migration of species between North and South America began approximately 2.8 million years ago with the formation of the Isthmus of Panama.