I've been feeding the birds all year round till this summer, when I had a major rat infestation (not living in my garden, but feeding from the bird food remains). How can I feed the birds but not the rats? The area where I was feeding the birds is in a hawthorn tree in the middle of a corner wild garden (my garden is all on the roadside, ie in full view of passers by, so the little rodents, while no bother to me, were of major concern to my next door neighbours). Any useful advice would be very welcome, as I loved feeding the birds, and we had a very healthy starling and sparrow population, as well as blackbirds, robins, blue and great tits, goldfinches and wood pigeons and collared doves.