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for ecology types: are there species in the wild that don't exist at approx 50/50 male/female?
Lots. https://en.wikipedia.org/wiki/Sex_ratio And it can get very complicated with species with >2 or otherwise weird sex systems.
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E.g. clown fish, very peculiar system. https://en.wikipedia.org/wiki/Amphiprioninae#Reproduction …
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