Heh. True that.
The same mechanism may have been at work for the various Martians, and the Apts, Banths, Thoats, Calots, Thoats, Orluks, Sith, Tharks, and Darseen.
Perhaps not so for the White Apes, though, for wasn't there a version in Moldvay Basic?
EDIT: +'t'