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Neraph t1_istfrlx wrote

Reply to comment by HairAreYourAerials in TIL that when a cat has a flat face (such as a Persian), that is actually a deformity. Breeders, however, are able to find ways of altering the cat’s genetics by choosing who they breed with. They do this because so many people gravitate to the smushed in face. by dioWjonathenL

Turns out most of them do. How many breeds of dog now have hip dysplasia as a breed? Red hair in humans leads to lower pain tolerance and greater risk of sun damage to the skin. Bacterial resistance tends to make organisms that don't do as well under ideal conditions, though they can survive extremes well.

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