Three eggs taken from bluebird nest? in Backyard Birds, Feeders and Food Posted April 28 Hello all, hopefully this is an appropriate place to post this. I have bluebirds in one of my nest boxes. There were 5 eggs in the box as of two days ago, which had just been laid. Today when I checked the box, there were only two. Then I spotted the remains of three broken eggs on the ground near the box. The parents are definitely still in the area and attentive. I’m not sure how this could have happened. This is the one box on my property that doesn’t have a predator guard yet (so of course they chose that one). But if a predator got in, it seems strange that it would leave two eggs intact. There are wrens who just began building in a box nearby, but I’ve actually never had much trouble with wrens before, despite them being common around here. Is it possible that the bluebirds recognized an issue with eggs and threw them out themselves? anyways, my main question is should I install a predator guard or wren guard, and if yes is there a way I can make a makeshift one right away with materials I have around my house. Thanks.