Conversely, a sudden "now you see them, now you don't" end to the dinosaurs implies a catastrophic cause. Depending on location and interpretation, the fossil record seems to say different things.

For years, researchers assumed that because most modern reptiles are ectothermic ... this ancestor was warm-blooded — meaning endothermy arose prior to dinosaurs. Cold-blooded dinosaurs would ...

A new study in Nature describing a fossil of a nearly complete and intact bird skull from Antarctica is shedding light on the ...

Many think dinosaurs first emerged on land well south of the equator that now forms part of Argentina and Zimbabwe, but they may have actually arisen in tougher conditions near the equator ...