sudden death of our baby bluebirds
I am asking for information about what could have caused this. We had five who were so close to fledging I thought maybe they had gone when I didn't see their little heads bobbing in the hole of the house. It was obvious something had gone wrong, because the parents were clearly bewildered. I didn't see a sparrow around the box, and when I looked at their little bodies when cleaning out the house, didn't see pecks. I thought about lawn pesticide, but the parents are OK and still coming back to the box (I'm hoping they'll build another nest and start again.) No sign of blowfly maggots or the flies themselves (I took out most of the nest to look it over). This is so bewildering and sad, and I'm hoping to avoid it again if possible.