I bought sunflower chips to feed them and they have not disappointed me in being at the feeder.

The heated birdbath was also a hit.

I heard that empty bluebird boxes can attract them in winter on cold nights. The new birdhouse I bought was empty. I opened it up the other day and found lots of small bird droppings inside so something was there.

The most interesting observation was a male bluebird in my flower pots. I have grown Narcissus species and Allium perdulce in these small pots on my deck. As many rock gardeners do, I topped the pots with Gran-I- grit, something picked up from a feed store and used for poultry. I purchased the grower size which is not as fine as the starter( almost like sand) The bird has visited the pots each day and is removing some grit each time.

I also noticed a Cyclamen tuber uprooted so guess he was digging around in other flower pots.

Perhaps it was a chickadee inside the box. I'll have to look again after the cold weather has come through this weekend.

Thanks for the information.

The bluebirds are into my seed pots daily for the grit.
Pictures are not great, but a cardinal and at least three bluebirds were digging around in my wood chips ( white pine). I like the garden full of birds so there is a lot of leaf litter, wood chips, etc, plus many native plantings.