But the ostrich gave up on flight long ago in favor ... and weighed around 70 kilograms (154 pounds)—making it the largest flying bird to ever exist. Scientists believe it flew much like modern ...

According to reports by National Geographic, an ostrich has an impressive running speed of about 43 mph or 70 km/h, although it is incapable of flying! These birds can also run at incredibly high ...

An ancient species of giant flying squirrel was found in a sinkhole lake fossil site in eastern Tennessee. Photo by Dan Meyers via Unsplash Scientists had an idea of what prehistoric Appalachia ...

Now, they are adding giant flying squirrels to the picture. Researchers discovered a partial fossil of a giant flying squirrel estimated to be about 5 million years old at the Gray Fossil Site at ...