Describes a form of track on the agar seen for some classes of uncoordinated (unc) mutants, in which the animals move forward in exaggerated circular paths, often turning continuously with little net progress across the plate. This is a behavioral change, and not the same as the rolling motion caused by some cuticle defects (e.g. not like a “rollerâ€) ( Hawasli et al., 2004).