Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many as 40,000 years ago, officials announced Friday, calling it the biggest such find here in decades.

Millions of years ago much of Mississippi was underwater and dugongs, sometimes called sea cows, roamed the warm coastal ...

The prehistoric remains were found by volunteer cavers at Stump Cross Caverns near Pateley Bridge.