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 ...

Dinosaurs sit at the crossroads between reptiles and birds, leading scientists to debate whether they were warm- or cold-blooded. A new study may have found the answer for different groups of ...

Endothermic animals commonly known to people include mammals and birds, but there are also some fishes that can heat themselves up. Over hundreds of millions of years of evolution, at least 40 species ...