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Look at the legs, the toes on the females will probably be light too and since you asked I'm guessing you are seeing a difference in color of the legs and toes and that usually mean female.
And the beaks shouldnt be pure black, I think its mainly a shadow on the one I posted making hers look black but I have never really paid attention to the beaks so there may be some male and female color difference there too like the legs but I wouldnt count on it. But the legs and the back color get you pretty accurate sexlink on pure barred breeds when you know what you're looking for.