A new study suggests dinosaurs might not have been as cold-blooded as we thought By An illustration shows a pair of adult tyrannosaurs and their young living in the Arctic during the Cretaceous Period. (James Havens /Courtesy University of Alaska Fairbanks) Dinosaurs are often depicted as large beasts roaming through tropical forests or across hot deserts — and the humid jungle of Jurassic Park may have gone a long way to solidify those images. Current Biology contradicts those ideas. It suggests that these creatures also lived year-round in what’s now northern Alaska, where they endured freezing winters, snow, and months of darkness.