Armadillos interacting with redstone

With the armadillo winning the mob vote and the update already having planned redstone features I thought of a great way armadillos could match with that part of the update. Imagine if armadillos were light enough on their feet to not trigger pressure plates, but when they roll up into a ball they cause the pressure plate to activate. This could allow redstoners to set up complex machines that used the mob's behavior to benefit.