As landmarks go, a rodent-shaped hole in a Chicago pavement is probably not the best of what the United States has to offer.

In general, evolution is a long, slow process of tiny changes passed down over generations, resulting in new adaptations and even new species over thousands or millions of years. But when living things are faced with dramatic shifts in the world around ...

When people think of prehistoric life, they tend to jump to two behemoth bookends — the towering dinosaurs of the Mesozoic era and then the woolly mammoths of the ice age. But what about the millions of years in between? The new exhibit “After the Age ...