Mother Nature Network: It might not seem so extraordinary to find fossils of a monkey species in Panama. Today, the country is home to eight species of monkey.
But consider this: The fossil evidence found of this ancient South American monkey species dates back 21 million years, well before the isthmus of Panama connected North America to South America. Somehow, this species managed to cross 100 miles of water from South America up to North America. And it did so about 18 million years earlier than the earliest known...