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And I also wish to. Know the species where male exogamy exist

I don't think the term for what you want to ask is male exogamy. But I think l get your question. You mean the species in which makes leave their parental groups? Well Lions and elephants. An example much closer to humans would be Gorilla.

Well, for whatever reason humans societies evolved the way they did, it is no excuse to deny anyone their rights today. The fact that humans evolved a brain with both rational thinking and immense empathy overrides any excuse to be an ass to anyone. My response was to the why in the child's question , not a justification of why humans should carry on Luke their cousin apes. Apes didn't visit moon , we did, we should act better.