Hedgehog, not rat-friendly garden

I have both hedgehogs and rats resident in my garden. May be because I have a compost heap and ponds. How do I get rid of rats whilst leaving the hedgehogs unharmed? I have tried the poison traps with rat-sized holes but they don't seem to be working.
Last edited: 23 October 2016 10:44:59
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Thanks Tetley. Yes, there is some evidence that rats are using the traps, but there are so many other food sources in the garden (compost heap) and I have frogs, toads and hedgehogs using the heap so am loathe to get rid of it. I'll persevere with the traps then.
Spilt food from bird feeding (you or your neighbours) will also encourage rats.
I've got 3 bird feeders. Neither they nor the rats are close to the house. I'm more worried about the hedgehogs in the garden as l understands that rats can attack them and kill their young.