system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why did primitive humans (e.g. Neanderthal) disappear?

I know that it can happen for a whole species to go extinct, but my impression is that every group is still represented by many different animals. Also, if non-human primates are able to survive in the wild, our ancestors who are supposedly smarter should still be out there. What caused them to disappear?
gpt
Neanderthals were competing for the same environment as our ancestors. Our ancestors won. Neanderthals has to move to areas that were less hospitable to them, and could not adapt and survive. 

That said, there's a lot of evidence that our ancestors and neanderthals did, in fact, interbreed. Many modern humans have traces of neanderthal DNA... so in a way, they never really disappeared.