Judging from Max's picture, it appears that Mudokons regularly ride elums (is the plural elum or elums?). I think that the Mudokons that you whistle to for passage trained elum in preperation for assissting the chosen one in his quest. Just a guess, but I can't think of anything better. Elums, though not neccesary the elum Abe uses will probably be in the Habitales(if OWI ever make them) as they will focus on the day to day lives of the inhabitants.
Congratulations Xavier! 10,000! Yay!