original: description pack rats are prevalent in the deserts and highlands of western united states and northern mexico .
simplifications: description pack rats are common in the deserts and highlands of western united states and northern mexico . description pack rats are widespread in the deserts and highlands of western united states and northern mexico . pack rats are prevalent in the deserts and highlands of western united states and northern mexico . description : pack rats live mostly in the deserts and highlands of western united states and northern mexico . pack rats live in the deserts and highlands of the western united states and northern mexico . description there are many pack rats in the deserts and highlands of western united states and northern mexico . description : pack rats are normally seen in the deserts and highlands of western united states and northern mexico description pack rats are prevalent in the deserts and highlands of western united states and northern mexico .