On a similar vein – three Apache Squaws are pregnant, and it was the tradition of the tribe for the father to go out and kill and skin an animal so that the baby will be born on a fresh hide. Two of the braves go out locally and come back with buffalo and deer hides for their Sqauws, the other is gone for weeks, and returns with a hippopotamus hide (don't ask where he found a hippo in North Amaerica)
Weeks later and the three Squaws have their babies, two have single babies and the other (with the hippo hide) has twins
Which goes to prove…
Groan button at the ready….
The sum of the sons of the squaw on the hippopotamus is equal to the sum of the sons of the squaws on the other two hides