For the two or three people left on earth who haven't seen this before:

The Planes Indians practiced polygamy, and one chief had three squaws.

The first squaw lived in a teepee of elk hide, the second in a teepee

made of buffalo hide, and the youngest in a teepee of hippopotamus hide.

The chief slept with each wife on the eve of his great hunting trip.

He was gone nine moons and when he returned, he went into the elk hide

teepee and found that his wife had borne him a son. Likewise, in the

buffalo hide teepee, that squaw, too, had borne him a son. So, imagine

his surprise when he found twin baby boys in the hippopotamus hide

teepee.

This just proves that …

The squaw of the hippopotamus is equal to the sons of the squaws of the other two hides.