Most heteromyids live in complex burrows within the deserts and grasslands of western North America , though species within the genera `` Heteromys '' and `` Liomys '' are also found in forests and their range extends down as far as northern South America .
Most heteromyids live in complex burrows in the deserts and grasslands of western North America . Some species within the `` Heteromys '' and `` Liomys '' genera are also found in forests and can be found down as far as northern South America .