| Hair for insulation is a correlate of endothermy, the physiological maintenance of individual temperature independent of environmental temperature. |
| However, the bone microstructure indicates rapid growth, as in sauropods and extant mammals, which suggests endothermy. |
| It is clear that endothermy need not be evoked in order to explain apparently stable temperatures in medium-sized dinosaurs living at midlatitudes. |
| Different lines of evidence indicate that endothermy as it is known from modern birds and mammals may not have been feasible for most, particularly larger, dinosaurs. |
| The timing of endothermy in the development of altrical birds. |
| Some dinosaurs may have been so endowed, and although they seem to have possessed the cardiovascular system necessary for endothermy, that capacity does not conclusively prove that they were endothermic. |
