Live HippoPolyus! Giant Roly Poly Isopods by Pocket Pets Giant Roly Polys (Also called Potato Bugs, Isopods, or Pill Bugs) This personal side kick will stay in your pocket and go wherever you go. Perfect first pet for children. Meant to be used with a Pocket Pet Habitat and Roly Poly Farm available on Amazon Young Hippos are shipped (4-6 weeks old) that can grow to over one inch long All exotic Pocket Pet Roly Poly species ordered together will be combined to save on shipping.