Many dinosaurs were likely warm-blooded with high metabolic rates that resembled those of modern birds, according to a study published yesterday (May 25) in Nature. Comparing samples from more than 50 ...

Since the birth of paleontology, scientists have hotly debated whether dinosaurs were cold- or warm-blooded. It's been commonly suggested that warm-bloodedness was an avian innovation, something ...

Were dinosaurs cold-blooded lumbering creatures or warm-blooded and agile? A new study has come up with a surprising answer. Dinosaurs were once portrayed as giant, cold-blooded, lumbering lizards.

The rotund, silvery opah looks less like a deep-sea predator than a Mylar balloon, with curved pectoral fins that flap like wings. Its chest muscles account for almost a fifth of its body mass and ...