Tumbleturner

rolling spheres of sand-covered dirt held together by the dense roots of the Tumbleturner plant. It survives on sunlight and whatever it can run over.
Some myths about the plant says the tumbleturners are a network of creatures created by an eccentric young Susan. Mostly this is based on the ear-shaped holes that form on the smaller harder to see varients of the plant. This has been officially disproven by Ficium scholars several times.