Were dinosaurs warm-blooded or cold-blooded?

Scientists have conflicting opinions on this subject. Some paleontologists think that all dinosaurs were 'warm-blooded' in the same sense that modern birds and mammals are: that is, they had rapid metabolic rates. Other scientists think it unlikely that any dinosaur could have had a rapid metabolic rate. Some scientists think that very big dinosaurs could have had warm bodies because of their large body size, just as some sea turtles do today. It may be that some dinosaurs were warm-blooded. The problem is that it is hard to find evidence that unquestionably shows what dinosaur metabolisms were like.

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Image: Fossilized Tree Trunk
August 1, 2004

Fossilized Tree Trunk

Fossilized tree trunk on a a ridge along the Missouri River, near Fort Kipp, MT.

Image: Mammoth Fossils

Mammoth Fossils

Excavation of the initial Columbian mammoth remains found at the Ziegler Reservoir site.

Attribution: Land Resources
Image: Mastodon Fossil

Mastodon Fossil

Denver Museum of Nature and Science personnel excavate a large mastodon tusk at the Ziegler Reservoir site.

Attribution: Land Resources