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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.
Men and women have the exact same number of ribs. 12 pairs of ribs (sometimes 13, sometimes 11, never just one lonely extra rib) per skeleton. Male on the left, female on the right. Same number of ribs.