How often should bird feeders be refilled? - whenever they get empty? And do some feeders dispense seeds too rapidly?
Some sites on the web say that if you have a bird feeder you should keep it stocked. However, it seems to me that bird feeders can attract hoards of birds if they are always full. I'd think there should be some compromise schedule where you let the feeder stay empty for awhile before refilling it, especially if a lot of seed gets dropped on the ground around the feeder.
Is there an optimum rate at which a feeder should dispense seeds? Should the birds have to work a little to get them out?