What unusual characteristic is associated with yak sweat secretion related to their coat insulation?

Answer

They produce a unique, sticky sweat that helps mat their under-hair

Yaks produce a unique, sticky sweat that mats their dense under-hair, which adds an extra layer of insulation, supplementing the fact that they have few functional sweat glands.

What unusual characteristic is associated with yak sweat secretion related to their coat insulation?
animalmammalfactherbivoreyak