The face is actually a Flehmen response, if I recall correctly. It helps them smell pheromones and such.
Maybe the reason why we wrinkle our noses when we smell something is some kind of remnant after this behaviour. Also because we're displeased with the smell, I guess.
Maybe the reason why we wrinkle our noses when we smell something is some kind of remnant after this behaviour. Also because we're displeased with the smell, I guess.