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https://scitechdaily.com/rewriting-evolution-study-shows-neanderthals-and-humans-were-not-the-same-species/Interesting paper. It's turning out that species is a slippery concept. If two species never interbreed, they're clearly separate. If the occasionally interbreed, they may still be separate, but how occasionally? I'd agree that Neanderthals are separate. It's interesting that interbreedability can go on for a surprisingly long time, hundreds of thousands of years. Some plants are still separate species after tens of millions of years of interbreeding.
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