Thanks for the pictures of the bluebirds Mike. The reason that they are so tame is that about 35 years ago they were almost extinct and folks down south started a campaign of building bird nesting boxes for them. Me included. So most of them are raised in peoples yards. There was one problem with the box project and it was that folks were putting them to close to the ground (they wanted to peep in and see the babies) and the snakes (which are always a danger) had a feast. It took me a couple of years to get it all figured out but when I did I was one of the most successful ones at raising them. My neighbor tried for several years to attract them but finally gave up. He just was not paying attention and was to proud to ask why I was doing so well. The ancestors of the ones that I have now were my first ones. They are very faithful once they find an ideal location they will return year after year.
The project worked as it saved them and the population had increased. Glad to see that you guys up north are taking care of our babies. I use to worry about them in the winter until mine started staying all year long here. They eat insects and earth worms mostly. They love the earthworms. I would rake leaves and of course rake up earthworms and they would swoop down and get them. I had to be careful sometime to keep from raking over them. I don't think that I have ever seen one at a feeder. They will drink water and take a dip in the bird bath.
I also have a group of chimney swifts that have been coming for just as long. They annoy the wife at night with them beating their wings to keep their babies cool so she is not to fond of them. I can't hear them but they do create some dust that does produce a little residue around the outside of the fireplace.