Well If you have ever seen TRES fledge theres no way a baby Blue will make it. I would almost opt to candle the eggs and if there is little to nothing there get rid of them. Is it possable to tell the difference between babies at hatching time? I would want to put them in the Blues nest but that could cause problems too. Lets think babies not eggs here. No way a blue can survive with a TRES Mom, overloading a Blue or having babies hatch days before her clutch could result in dead babies. Yikes this is one for Bet, Malinda or Cornell. Im still thinkin destroy the eggs so no babies ever suffer.

Hi Kate, Congrats on attracting a pair of blues. Please don't remove the new clutch of eggs. It could be that the male is infertile or a problem with the female. She is incubating right? A member on bluebird nut cafe had eggs hatch on day 18 so anything is possible. I would suggest you join the bluebird nut cafe and post your question there, you will get much more assistance with this problem and any others you encounter. Hope to see you there. http://bluebirdnutcafe.yuku.com/ -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....

Hi Mary- the only other possibility that I can think of is if something happened to one of the original mates & the remaining one found a new mate, the new mate will rarely have anything to do with the eggs/babies since they weren't their offspring. In this case, the new mate often steers the original mate away from the eggs/babies so they can try to produce their own (may not even try to produce since it's late in the nesting season). I would think it would be one of those scenarios. Research shows that it's about 10 degrees hotter in the box than it is outside. If it's in 90's, it could be too hot for them. Hatchlings can't regulate their own body temps for first 6 days. Risk would be same if too cold at beginning of season. If lawn pesticides (could be neighbor's if yard is close), babies are usually bloated. Did you notice anything unusual with them? Bloating or markings? Those are my only thoughts. Such a bummer & so sorry!