Do all the other ducks know that a duckling is a drake

I actually wondered this too when someone posted about his older ducks picking on a particular younger duck of a few he brought home. The OP didn't know the sexes yet, but some of our astute BYC folks said that the old drake must've known which one of his little ones was a drake, so he was picking on it.

I didn't understand how that older duck knew the sexes before a person knows. Do they sense it or smell it?
 

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