
SIOUX FALLS, South Dakota - Tyrannosaurus rex may have been known as the big guy around the Hell Creek Formation 66 million years ago, but a newly discovered species of raptor would have roamed nearby as one of the region's most lethal predators.
SIOUX FALLS, South Dakota - Tyrannosaurus rex may have been known as the big guy around the Hell Creek Formation 66 million years ago, but a newly discovered species of raptor would have roamed nearby as one of the region's most lethal predators.