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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.
How Many Ribs Do Humans Have Sep 18, 2011 It is widely known that all vertebral species have ribs 1. Humans have a complex rib cage 2 which comprises of the sternum 3, ribs and some other parts. Every doctor knows how many ribs people have, but an ordinary man can have some difficulties with such a question. In fact, it is no difficult to memorize the answer: Every human (both men and women) has 24 coupled ribs (that is, 12 pairs)