The mostly flightless, meat-eating dinosaur descendents were the size of dogs at their smallest, but the largest known ...
In Colombia, a fossil-collecting rancher has found a giant, flightless killer from 13 million years ago — and a missing link ...
Evolutionary biologist Federico Degrange from Argentina's Center for Research in Earth Sciences and colleagues found the bird ...
A fearsome flesh-eating bird from the Phorusrhacid family - known as "terror birds" - may be the largest of its kind ever ...