Mississippi has changed over millions of years and everything from sea monster to dire wolf fossils can be found here.

"We've been fossil hunting pretty strong for the last two summers, particularly when the river was low," Aguzzi said. "We've found mammoth teeth ... a jaw from a saber-toothed cat.

Sabertooth cats make up a diverse group of long-toothed ... By examining one of the largest global Pliocene collections of fossils in Langebaanweg, north of Cape Town in South Africa, researchers ...

Scientists led by fossil ... cat-like predator tracks from about 29 million years ago. The NPS commented that a set of paw prints found in a volcanic ash layer may belong to a nimravid, a saber ...