I don't think redcurrant cake is proper bird food!
We have a problem with a guy who dumps food at the lake. At first it was just old bread that he got from a local shop but the problem was that he came with 4 or 5 carrier bags and sometimes even large trash bags full of bread. Now he also brings cakes, vegetables, processed foods and just dumps it there. It stinks and looks terrible.
I have contacted the city council and the local newspaper to see if they can do anything about it.
Euch. Great colour but not so keen on the subject, as you say, it's probably good for rats... Over here there's a bit of a focus on not leaving bread for the birds, especially ducks. Fingers crossed he gets the message.