Gender – Help

Hello everybody

We have hatched some quails for the first time ever. I would really appreciate if someone Could to help with the gender on them.
Thanks

1, 11, 12, 16, 15, and 17, I’m not sure.
2, 4, 6, 7, 10, 13, 14, 18, and 19 are roos.
3, 5, 8, 9, are hens.

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