The nostrils in apes and monkeys are almost at the front, but in humans nostrils (external nares) face downwards. Also a lot of non-primate mammals like goats have nostrils at the front.

Is it the increased cranial capacity in humans which pushed the nostrils downwards?

Is having a pair of downward facing nostrils, an advanced feature? If yes, then why?

  • $\begingroup$ I think you're right, there's a lot of articles here: google.fr/… Some people do have quite upturned nostrils, it seems that dust, aridity, cold, long distance running, checking food, swimming, diving, and talking to people who have caught a cold are good reasons to have discreet nostrils and longer nares. $\endgroup$ Sep 30 '17 at 14:31

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