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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.
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: if it only has twelve ribs, it's a rabbit; if it has thirteen ribs, but only one pair of floating ribs, it's a cat