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with females of their own species. This presents a problem for P. formosa, as they must compete for males who do not favour them. However, those P. formosa successful in finding a mate make up the deficit by producing twice as many female offspring as their competitors. Among salamanders, the Ambystoma platineum, a unisexual mole salamander, is hybrid of sexually reproducing A. jeffersonianum and A. laterale.

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