Imagine standing on a muddy riverbank 50 million years ago and seeing a strange creature lumbering by—part crocodile, part ...

Then a similar 29-million-year-old tooth was found in Puerto Rico. However, neither fossil could definitively show just what particular predator reigned atop the Caribbean food chain. Then a research ...

A newly discovered "hell ant" fossil may be the oldest ant ever found, scientists say. This fossilized insect was unearthed in what is now northeastern Brazil and lived around 113 million years ...