(1) The pelage of these animals is soft, silky, and dense.(2) The pelage lacks underfur and is usually some shade of brown.(3) The pelage consists almost entirely of underfur; it is remarkably iridescent, fine, and silky.(4) The third color phase occurs during the first pelage of young wolves.(5) The evolution of endothermic metabolic rates and pelage and plumage in the earliest mammals and birds, respectively, followed radically different sequential chronologies.
