text: Geomyoidea is a superfamily of rodent that contains the pocket gophers ( Geomyidae ) , the kangaroo rats and mice ( Heteromyidae ) , and their fossil relatives .
simplified: Geomyoidea is a superfamily of rodents that contains the pocket gophers ( Geomyidae ) , the kangaroo rats and mice ( Heteromyidae ) , and their fossil relatives .