Relax she knows what she is doing. Sometimes the female will skip a day and then lay more eggs or maybe she is done. When she is done laying she will start to incubate full time which is not necessarily 24 hrs a day. They know what to do even without our help! LOL Cathy

I would definitely give them 21 full days before deciding they were infertile. I did see that happen one time, through in an in-box nest cam that belongs to my friend. Three eggs laid and the female started incubating, or at least we assumed she was since she was staying in the box. We had a 3 day cold snap soon after the eggs were laid. On the 21st day I WATCHED one egg hatch! I could not believe it. The female removed one of the remaining two and my friend removed the other about 3 days later (it was infertile). That one little baby blue had a big nest all to herself and she fledged safely, right on time. 18 days is unusual but Jane mentioned the incubation thing, when it actually starts, and that can make the difference. Good luck and keep us posted.

Hello Michael, First I am glad you found this site, I was happy when I found it to, but I would like to invite you to join the bluebird nut cafe and we will provide you with all you need to know about these birds. It is way more active and you will get fast answers to your questions. Hope to see you there. http://bluebirdnutcafe.yuku.com/ Secondly your bluebird pair have committed to that nest with eggs so they won't abandon it easily. How much rain are you getting? One year I had blues there were several days of rain and no bugs except earthworms around to feed the babies. They didn't survive despite the parents efforts. My guess is your pair has left to find a food source and will return. I do find it odd that they left when you are providing mealworms. I would recommend you ask this question on the bluebird nut cafe site to get other's input. -Tyler

Very odd things happening with my houses this year. I had bluebirds in one house that laid 5 eggs. For the most part I try to stay away so they don't get spooked. In this case the next time I checked there was one fledgling that I saw but he didn't seem ready to fly away yet. But when I checked 2 days later there were no babies or eggs. The nest was empty. This box was protected with the mesh on the opening. I'm hoping time just flew by and the brood hatched and fledged in my absence! Will the parents start a new brood in the same nest or should I clean the box out for them to start over? I had another box that had activity, 5 eggs layed and a week later no eggs or babies. I fear they were killed since it was an old house from last year and it did not have the protective metal mesh at the opening. I have a nest nearby with the mesh protection. I kept checking and there was no activity or eggs. Then suddenly there was one egg!! I assumed the mom would lay more. I checked for 2 days, still only one egg. The third day the egg hatched with a tiny bald with a little fuzz baby bird. I kept watching from a distance and I did not see the male or female going into the house. I skipped looking inside the box today. I wanted to stay totally away. Tomorrow I will check again. I hope the little guy is okay.... Is it unusual for a female to lay only one egg? I'm thinking that perhaps the pair that were in the other box moved to this box when a predator got their other eggs..... Thus only one last egg to lay??? The box with the one egg is about 20 feet from the empty box. Perhaps this is part of that brood? Can the mom or dad move an egg or did she just lay it in a different box?? I have another box about 100 feet from that one protected with the mesh that some sparrows have taken over. They have built a nest and hang out in front of it on the mesh opening and on top of it but no eggs for well over a month. Perhaps they are the culprits that got the 5 bluebird eggs. Very strange that they built a nest and aren't using it. I know they will build several, one as a decoy or to give the female a choice, but I don't see that they've done that unless they are planning to take over the bluebird box. I will be keeping a watch on that....