Funny stuff when they thump and take off in the room for fun. Ever see it put it's head between it's legs and come up chewing? Ha! That's the vitamin turd. Ever so often, and they know when it's going to happen, an odd shaped turd is coming. That's the one they know holds the minerals and such that we not processed inside. They eat it again. It's smart, funny, and gross to us. Cheers!