If humanity were destroyed by nuclear war or a man-made biological weapon would it be the first ever species to destroy itself as opposed to being destroyed by another species or external circumstance like a meteor or disease?
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Extreme intrasexual competition among males could drive a species to extinction. Maybe what happened to Irish elk, antlers got too big https://en.wikipedia.org/wiki/Irish_elk
This is cool as hell but I doubt that they were able to grow these massive antlers if that subsequently was what killed them. More likely, they were killed by humans for meat, like many other megafauna?pic.twitter.com/B00bdc3sKz
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To your point though, I think you're basically right. If anything is going to kill the human race it's going to be some power-hungry dude who wants to create a utopia where he king, aka intra-sexual competition.
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