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Tag for questions related to the differences in appearance between males and females of the same species, such as in colour, shape, size, and structure, that are caused by the inheritance of one or the other sexual pattern in the genetic material.
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How do non-dimorphic birds distinguish sex of possible partners/rivals?
As very well explained also in Wikipedia https://en.wikipedia.org/wiki/Sexual_selection_in_birds , visual signaling is only one of the way birds uses to pick a partner, olfactory and acoustic signals …