I had the same happen in my aviary, but with chinese painted quail and an Indian ringneck hen.

The ringneck hen had come into breeding condition and was attacking the quail in the aviary.

Of course you cannot completely rule out rat attacks. You be surprised the size of hole they can squeeze through.

I would separate the remaining quail from the rosella and take it from there

__________________

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~Nikki~
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Deedee - Timneh Grey 31.05.01 - 22.06.06