For more than 100 years, researchers assumed that dinosaurs were like giant lizards: sluggish reptiles that spent most of their day basking in the sun. This image changed when we started to realize ...

DALLAS — Scientists once thought of dinosaurs as sluggish, cold-blooded creatures. Then research suggested that some could control their body temperature, but when and how that shift came about ...

(CNN) — Were dinosaurs warm-blooded like birds and mammals or cold-blooded like reptiles? It’s one of paleontology’s oldest questions, and gleaning the answer matters because it illuminates how the ...

(CNN) — Were dinosaurs warm-blooded like birds and mammals or cold-blooded like reptiles? It’s one of paleontology’s oldest questions, and gleaning the answer matters because it illuminates how the ...

You may not know this, but the warm and/or cold nature of dinosaurs is ... hotly contested. A study last year put dinosaurs solidly in between cold-blooded reptiles and warm-blooded modern mammals, ...

This illustration provided by the University of Vigo and University College London, depicts a dromaeosaur incubating its eggs as snow falls. (Davide Bonadonna/University of Vigo/University College ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. DALLAS (AP) — Scientists once thought of ...