There are some arguments about dinosaurs being an endotherm. It is believed that they are reptiles and were not endotherms. However, there are shreds of evidence that consider them to be endotherms. The first evidence is that a dinosaur fossil had been found in the polar region, where only endotherm animals can survive. Nevertheless, the lecture tells us that the polar region was warm enough for ectothermy animals and when the polar region became cold, animals that were not endotherms migrated to warmer climates. The second piece of evidence is Endotherms allow animals to do physical activity such as running, and it is possible for the species who have a leg structure positioned underneath their body.