^ This.
We have had bird-feeders in the garden for 40 years. Tits, especially, hurl the seed out onto the ground at an impressive rate to find their favourites. This is good for the ground-feeders, like blackbirds and dunnocks and - rats (and woodmice). Normally it has been manageable and very interesting to watch the interactions between the birds and the rats and squirrels. But this year, when we got to two adult rats and nine young all swarming around at once, we decided, with heavy hearts, to remove the feeder. Never seen a rat since. We know they will be around (they like electric cables in the winter) but we don't see them in the garden. They have to eat, so they move their feeding operations. Sadly, it's reduced the bird activity but at least they have raised their young.