Different people and animals have different wavelengths in the curls in their hair. I understand what purposes hair serves in protecting the skin from light and bugs. I am wondering about the eventual physiological consequences of curly vs straight hairs.
Do the curls help in cooling, blocking light or catching wind over flat hair? Does the wavelength in curly hair have intrinsic properties that physically would give an animal advantages in climates where straight hair would not?
I will be happy to accept another answer.