Fifty thousand years ago, North America's landscapes were alive with an astonishing array of enormous creatures. Massive ...

Scientists identify the oldest flying reptile in North America, discovered in Arizona and dating back 209 million years.

The prehistoric species, called Swaindelphys solastella ... The new fossil is the largest marsupial -- in terms of body and size -- found so far in North America from the Paleocene period, Chris Beard ...

Fifty thousand years ago, North America's landscapes were alive with an astonishing array of enormous creatures. Massive woolly mammoths roamed vast icy plains, while dense forests echoed with the ...