Fossil tooth analysis confirms Tyrannosaurus rex was warm-blooded

Scientists have confirmed that the Tyrannosaurus rex was warm-blooded using fossil tooth analysis. This research supports a theory held for nearly 60 years. The findings follow the discovery of T. rex footprints in Alaska.
(CNN) — Scientists have suspected for nearly 60 years that Tyrannosaurus rex was warm-blooded. When a fossilized footprint of T. rex turned up in Alaska...
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