By contrast, the earliest dinosaurs were much smaller than their descendants -- more the size of a chicken or dog than a Diplodocus. They walked on two legs (were bipedal) and most are thought to have ...

Now, more than a decade later, new analysis of the fossils has found that they belong to a new 73-million-year-old species, according to a study published Jan. 28 in the peer-reviewed journal ...

The remains of the earliest dinosaurs may lie undiscovered in the Amazon and other equatorial regions of South America and ...