"Gophers" or Richardson's Ground squirrels tend to estivate in mid summer, avoiding the hot dry weather by staying underground. there is not enough moisture in the mature grasses to keep them hydrated, so they don't go out, since drinking water is not an option. I don't plan to shoot gophers after the end of July, not that there isn't any, but you won't see many. By September most are actually hibernating.