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 ...

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, ...

Dinosaurs were once assumed to have been ectothermic, or cold-blooded, an idea that makes sense given that they were reptiles. While scientists had previously discovered evidence of dinosaur species ...

This is an archived article and the information in the article may be outdated.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 ...

An artist's rendering of a feathered dinosuar in the snow. Feathers would have allowed dinosaurs, ancestors of birds, to trap their body heat in cold climates. Davide Bonadonna / Universidade de Vigo ...

Dinosaurs may not have been the slow, sunbathing reptiles researchers used to think. In fact, they may have been warm-blooded, new research suggests. The researchers studied the "growth lines" on ...

Tuna, opah, and billfishes such as marlins and swordfish are among the 0.1% of fish species that are warm-blooded. Evidence by an international team of researchers led by UC San Diego’s Scripps ...

Gatorland uses heat lamps, space heaters, and indoor enclosures to protect its cold-blooded animals like tortoises, reptiles, and Jawlene, the jawless alligator, during colder weather. While reptiles ...

If dinosaurs were reptiles, then why aren't birds cold blooded? When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. 'Rare' ancestor reveals how huge ...

DALLAS (AP) — 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 ...