Some scientist do not believe dinosaurs were endotherms Some scientist assume dinosaurs were endotherms, however, many scientist do not agree with that. First of all, they do not think that the polar dinosaur argument is persuasive. The climate of polar regions in that period might be warm enough for animals which were not endotherms to live. Even if the weather is cold, dinosaurs could move to warm area or sleep to save energy. The hypothesis that dinosaurs were endotherms is not the only explanation for the fact that dinosaurs’ legs are positioned underneath their bodies. Dinosaurs were huge animals, so this body structure is ideal to support weight. In addition, there is a defect in the bone theory. It is true that dinosaur bones have Haversian canals, but dinosaur bones also have growth, which indicates that dinosaurs grew more slowly during cooler periods, and it is a characteristic of animals that are not endotherms.