Mrs. Bluebird loves the mealworm feeder and has eaten most of the mealworms we put out this morning. I just love having her come to feed right next to our deck. Bluebirds would devour any amount of mealworms we put out, and that's just the adults. They aren't even feeding babies yet! She is still incubating.
So to keep it reasonable for us, we offer mealworms in the morning and late afternoon.