I've had 3 boxes out for about 5 years and this year i got my first bluebirds. Noticed them in and out and when I looked in there were 4 eggs. I'm not sure if there were 3 or 4 babies, but they've gone and it was so neat watching them grow and leave the nest. I've been feeding them mealworms, but now I haven't seen the parents around much, usually they are here in the morning for breakfast. I hope when the young get on their own that they come eat and i hope they all come back next year! I've added 2 more boxes, so I'm ready!! they came to a feeder right outside my bathroom window and tillie would even get a worm off the window sill. I've enjoyed reading alot on here! I still have much to learn!