A varanid lizard fossil sampled for the study showed isotopic variation consistent with being an heterothermic ectotherm, whereas that of the dinosaurs, including "Achelousaurus", it was consistent with them being homeothermic endotherms.
A varanid lizard fossil sampled for the study showed isotopic variation consistent with being an heterothermic ectotherm. It was consistent with them being homeothermic endotherms. This was of the dinosaurs. The dinosaurs were including "Achelousaurus".