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Asymmetry is not unusual The Welsh sow had 16 to 17 pairs of ribs compared with an average of all British pigs of 14. http://wgpublications.com/index.html?ref=news&sid=224&action=view&show=25 I hope that helps.
Cats have nine true ribs (attached directly to the breastbone), three false ribs (attached to the cartilage), and one pair of floating ribs. Rabbits have seven true, two false, and three floating. So cats have a total of thirteen ribs, but rabbits typically only have twelve (although it can vary). This gives us a simple test: 1  if it only has twelve ribs, it's a rabbit. 2  if it has thirteen ribs, but only one pair of floating ribs, it's a cat.