Sexing ducklings

[Goat_Walker]

What is the easiest way to sex newborn ducklings?
My hen is currently setting on about 15 or so and I want to keep the girls and give / sell the boys, since I dont need any more of those.
What is the easiest way to tell them apart?
What am I looking for?

 

[warmfuzzies]

Are you talking vent sexing? Because I think that is your only option. And that, i know knothing about, except that I know knothing about it.

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