Like, when you pet a dog/cat, their skin is sort of looser, they have a scruff of the neck and lots of rolls. But in humans, the skin is tight on the meat, even on the hairy parts like the scalp. Is there a reason for this?
In: Biology
Another fun factor is about shedding water.
Animals with fur that get wet need to be able to quickly dry off (or risk freezing).
Loose skin means that the wet-dog-shake has extra momentum and “whips” a bit, sending more water flying than if the skin was tight.
Evolutionary features like this often have many benefits, because evolution is frugal and there are many problems to solve.
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