There was an old Indian belief that by making love on the hide of
their favorite animal, one could guarantee the health and prosperity
of the offspring conceived thereupon.  And so it goes that one Indian
couple made love on a buffalo  hide.  Nine months later, they were
blessed with a healthy baby son.  Yet another couple huddled together
on the hide of a deer and they too were blessed with a very healthy
baby son.  But a third couple, whose favorite animal was a hippopotamus,
were blessed with not one, but TWO very healthy baby sons at the conclusion
of the nine month interval.  All of which proves the old theorem that:
The sons of the squaw of the hippopotamus are equal to the sons of
the squaws of the other two hides.