I've had them darn rats here since they moved the shed across the road from me, mine are weird though, never seen a two tone rat unless it was a pet, but my electric fence water tank combo killed 4 of them brown and white ones last year.
I had to wire my fence around the paddock because my husbands horse Jack eats my fences when he gets bored, and right oiver the tank is where they crawl up from their hole, well they must have hit the wire got shocked off the 2x6 and fell in the stainless steal water tank, and drowned. I can't imagine a low impedance fence charger would kill them.