Fully feathered bluebird baby dead in the nest box

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I feed bluebirds mealworms for years, and enjoy seeing the babies grow. This year, the babies just fledged (after 23 days), however I found one baby dead in the box fully feather, there are no apparent wounds or injuries. I feel so very sad.

The mom were feeding the babies as of last night, the baby shouldn't have died of starvation. Anyone would venture a guess as to the cause of the death?

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