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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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Accepted
Male and female seahorses: which is which
Seahorses are fish. Most fishes use external fertilization to reproduce (there are certainly exceptions, though), so there's not really any aspect of "giving birth" to sex definitions (that's a mammal …