While not having quite the same proportions, I have always held the belief that rat baits need to be "anchored". If the bait is able to be carried off, they will do so, to store it for winter. Most baits we have here have a hole through the middle, to allow it to be "secured". The rats then chew at it, and die as a result. We have bait stations outside, and normally they get hit as the weather cools off prior to winter.
Oz could be quite different though.
Gary
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