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"We also assume this number is even for pigs (as for most mammals), though not limited from the top."
Actually, my oldest dog has 9 nipples: they are alternating on left and right sides so that puppies have better access to them when dog lays on the side. :)
Thanks for sharing this :)
Really, after the task was created I learned that it could be an odd number for pigs also.
However I never thought that it is a kind of feature which allows easier access for puppies - though after your explanation I understand it very clearly. Really the Nature has a lot of wonders :)