The baby bluebirds in my nestbox fledged Saturday, all except one. I found it dead in the nest. I examined it and the nest but didn’t see any signs of blowfly infestation. I’m guessing this unseasonably cool Spring may be to blame despite me keeping mealworms handy for the parents. I’m just glad the entire brood wasn’t lost and the other 4 babies made it. I cleaned out the nestbox and it’s ready for new tenants again.