Neanderthals

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…your main source of communication as a series of grunts! All in all, Neanderthals have been the biggest influence to Humans. They look much like humans, had some of the same traditions as today, and are able to interbreed with humans, making people believe they were a form of humans. Yes, they were a form, but no one knows if humans killed them off, or if they simply interbreed to create this modern day human.