duh, yeah, that makes perfect sense! do you think it's a permanent isue? I fear it may be. What should I do? Thanks!

Thanks allan. Yes, I did say "if" because I can't say for certain that she did. I think that is the "usual" way they lay, isn't it? I actually did keep written records, and I can say with assuredness that the first egg was laid on April 27th, and then there were 2 eggs on April 28th. The next time I checked the box was May 5th, and there were 4 eggs that day.

What mlkbskt said is correct. A nestbox should never be mounted on a fence/tree or post of any kind unless it can be baffled. Conduit works best for mounting nestboxes on and stovepipe baffles are cheap and easy to put up. Nestboxes should also be put up at least 15 feet away from any trees. With just one egg gone I would think either House wren (are they in Texas?) or House Sparrow. The House Sparrow will usually just go in and smash the eggs and or kill babies and adults that may be in the box, however it could have gotten interrupted by the Bluebirds too. That is why a sparrow spooker is very important to put up after the first egg is laid. Sparrow spookers are easily accepted by Bluebirds. Wren guards are a little trickier though but do help if wrens are in the area. It is best to put them up during egg laying though to make sure they are accepted. The whiter end and ring on the egg is normal, I have seen it before too. A mockingbird would not be able to get into the nestbox so it would not have taken the egg. Is the hole on your nestbox the 1 1/2 inches that is standard for the Bluebird nestboxes? It shouldn't be larger to prevent Starlings or Red Bellied Woodpeckers from reaching in and grabbing eggs or babies. As far as the heat, I know it can kill nestlings if it gets too hot but not sure about affecting hatching, normally the Momma just wouldn't need to incubate as much. Day 15 is not out of the norm, I have heard of eggs going up to 20 days and still hatching. So the eggs can still be good, but if something got one chances are it could come back and get the rest. Raccoons love to reach into nestboxes and pull out babies/eggs and incubating female but they usually do it at night so the momma would be gone/eaten and probably all the eggs if it were a raccoon. Raccoons are everywhere even if you don't see them, they are there! I would keep a close eye on the Blues and see what they are doing. Are they still going to the box or not? Usually they will not give up on the nest if an egg is taken like that, so the nesting should still be ok and also they can sit on eggs a long time before they give up on them. Good luck, hopefully you can get this nestbox safe and can have a successful second nesting. Don't let the first nesting fool you since it was successful, an improperly mounted nestbox is a failure just waiting to happen. Read up at sialis like you said you were, there is tons of great info on there! Donna

If at all possible, I will try to get a video. He was on top of the nest box just outside my kitchen window and facing the main tomato garden. Wrens are great for keeping tomato plants bug-free. He's hopping up and down on top of the box. Sometimes with both feet, sometimes on first the left foot - hop, hop, hop - and then the right foot - hop, hop, hop. Sometimes his hops take him up a couple inches; sometimes a foot or more. He has both wings dropped down with his head bobbing. Then holds first one wing and then the other out at various angles and contortions...all the while doing the multi-footed polka, and singing his fool heart out the entire time. He flies straight up a couple feet and then zig-zags back down to the nest box top. Again, singing that fool heart out. I expected him to have a major coronary at any second. She looked at him; she looked in the box, (a very fine Coveside chickadee box, with slate squirrel guard, by the way) did the birdy version of an eye roll, and zoomed off. Her mama raised her better than to hang out with that sort of boy. But then...good girls and bad boys...we know how that story plays out at times!