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I have never heard anyone refer to Neanderthal as a human unless they are talking in a "those are cavemen, early humans" way that's wrong. Where is this coming from? Is it a non-English world thing?

Generally Neanderthals are pointed out as an exception to cross species fertility since... humans have some Neanderthal DNA.

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> Generally Neanderthals are pointed out as an exception to cross species fertility since...

There's no such rule and Neanderthals are not notable as an exception. Fertility is just a very rough proxy for genetic distance, which is correlated to our arbitrary "species" buckets but by no means a real line or hard rule. Many, many reasonably closely related species can interbreed, like jaguars and lions. Most of homo that had the opportunity could probably interbreed.

Wherever it’s coming from, it’s not based on any particular language. Museums in English-speaking countries use the term.

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