Hi again,
We had a problem a few years ago when we were composting. We cleared an old overgrown garden and found several small burrows which had been made by rats. After long conversations with the Pest Control Officer, he pointed out that without a food source being present the rats would move. Although we made our compost bin secure we still had rats in the garden until the Environmental Health Office discovered that a short distance away the local butcher was providing a food source. Once this had been stopped the rats moved elsewhere. It may be that your composting is not the principal food source for the rats, and unfortunately, live trapping can be very dangerous and impractical. It may be more effective to seek advice from your local council, particularly if there is Weil's disease in the local rat population.
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