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Neandertals are NOT a different species. You are falling for some of the belief system that once taught us Neandertals were sub humans incapable of speech.
Modern science has shown us that Neandertals were capapable of speech. They had slightly larger brains than us. They farmed, used tools, used cosmetics, likely enjoyed music etc etc.
Neandertal DNA is 99.7% similar to ours (People living today are 99.9% similar) Often the definition for a separate species is when interbreeding can't produce fertile offspring, however...We have inherited some of our genes from Neandertals. Neandertals are us!
Your claim Neandertals are a separate species is nothing more than an attempt to cling to your beliefs which science has proven wrong.
This is a recreation done from a skull of a Neandertal child. Not so different from people today.