Can you prove a bird feeder isn't a squirrel feeder? A woman in Canada was cited for "providing sustenance for squirrels." Since neither squirrel nor bird feeding is illegal where she lives, the question is whether she is attracting vermin through her "bird feeding" habits.
While this isn't the species I study, I'm a big fan of ground squirrels. The problem, is of course, in part caused by humans feeding them; I always have to wonder if there's another way (hawks? dogs?)...You can read about it here