Why don't any birds come when I put something in the bird feeder

Hint 1 of 9:

Have you read the sign next to the feeder?

Hint 2 of 9:

You need to give the birds dry bread *CRUMBS*.

Hint 3 of 9:

Read one of the ads in the Inquistor.

Hint 4 of 9:

It's the one for the garbage disposal.

Hint 5 of 9:

Notice that you can grind food, including bread, in disposals.