The mostly flightless, meat-eating dinosaur descendents were the size of dogs at their smallest, but the largest known ...

Also read Undiscovered Chopin Waltz Found in New York Library After 200 Years This fossilized leg bone suggests that the newly discovered terror bird could be the largest member of the species found ...

In Colombia, a fossil-collecting rancher has found a giant, flightless killer from 13 million years ago — and a missing link ...

But the team thought this age was too old. The timeframe precedes the peak period of the Phorusrhacidae, the official name given to 17 species of birds characterized by dagger-like beaks.