Thanks for the replies! The thing is, there HAS been a nestbox available both years. Last year it was on a pole (and I've got an extra baffle for the pole if necessary), and this year I've used it as a HOSP trap and mounted it on the house and then on a tree. The blues have never shown any interest in the nest box, where ever it was. Never even seen them go in or sit on it. They nested their first brood last year in another snag that had a hole about 20 feet up, but that snag fell over last summer so they moved to the one they like now. The only birds showing interest in the nest box have been the HOSPs (trapped 1 last year, 2 this year with the Van ert) and some HOWRs last year after which I removed their sticks and left the box open. Fortunately this year the HOSPs have since stayed away more or less and no sign of any HOWRs. X my fingers they stay away. I speculate that perhaps these birds were raised in natural cavities and that is what they're most comfortable with? There must be some way to baffle the tree?

I just did this too! They will abandon the nest if you don't take care of it, ASAP!! tonight if you can!. You need to do a nest change. There is good info on the sialis site about nest changes and how to do it. I got as much dried grass as I could and put it in an empty butter container. I tried to line it with pine needles, but I don't know where my female got hers?!! It took a few days, but then the second egg arrived along with a third! She was incubating a few days until a wren, I think, got two of them. Now they built another nest in my other box.. after all that work!! then you have to take care of the ants. They say grease the pole.. I put the liquid ant killer at the base on a plastic lid covered with a larger lid.. I hoped it would distract them from the nest, but I can't tell for sure if it worked since they moved.. but I didn't see any more ants in there. Good luck and keep us posted!

The male will not incubate the eggs. Its best to get rid of the eggs and hopefully he will find another mate and use the same nesting spot.

I feed bluebirds mealworms for years, and enjoy seeing the babies grow. This year, the babies just fledged (after 23 days), however I found one baby dead in the box fully feather, there are no apparent wounds or injuries. I feel so very sad. The mom were feeding the babies as of last night, the baby shouldn't have died of starvation. Anyone would venture a guess as to the cause of the death?