They are both females. The lighter one is a Ivory Pearl and the darker one is a Slate. On the Silver varieties the males would have pinkish feathers by the vent area. Both sexes crow. Actually it is not even a crow. It is more of a contact call. Only males make a windy type noise while puffing up their throats. I never go by bibs in Buttons only by vent feathers and windy noise.
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