Scientifically speaking, the only true "racial" differences are distinguished by totem.
This was conclusively proven by renowned anthropologist and explorer Dr. Renaldo Potrzebie, in his immortal treatise entitled "Totem: Zoology, Man, & Meaning" which he presented in 1954, before the Royal Academie of Astrophysiology in London.
Central to Professor Potrzebie's analysis of the characteristics denoting racial separations, is the totemus ramificatus, being the proven animal and biological DNA inheritance of mankind.
This is to say, that it is animalian genetics which plays the greater part in facial morphology, cranial capacity, and even the ever increasing incidence of polydactylism in separate but organically sound communities.
I wholeheartedly recommend this treatise as a background primer for all interested in race and racial differences.