Fearsome predators like T. rex and towering, telescope-necked dinosaurs, such as brachiosaurus, 

were warm-blooded creatures in the same way birds and mammals are, according to a groundbreaking new study.

The question of whether the blood that coursed through dinosaurs' giant frames ran warm or cold, 

like that of reptiles, is a long-standing one that has vexed paleontologists. 

Knowing that fundamental piece of information could illuminate the lives of the prehistoric creatures in significant ways.

Warm-blooded animals have a high metabolic rate — they take in lots of oxygen 

and need many calories to maintain their body temperature, while cold-blooded animals breathe and eat less.

the question of whether dinosaurs were warm- or cold-blooded is one of the oldest questions in paleontology, 

and now we think we have a consensus, that most dinosaurs were warm-blooded," 

said lead study author Jasmina Wiemann, a postdoctoral researcher at the California Institute of Technology, in a news release.

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