There's new evidence that early humans and Neanderthals lived side by side and interbred. Humans and Neanderthals were two closely related, but different species of the same genus. The Neanderthals died out 28,000 years ago and it has long been thought that humans, who were more violent than Neanderthals killed them off.
Archaeologists have just found the remains of a settlement in Northern Israel that appears to have had the two species living peacefully together. Stone axes and flint arrow heads from both groups were found in the limestone of a cave and none of the bones had lethal wounds.
Neanderthals get kind of a bad rap in our society. In fact, it has often been used as a word of derision for someone acting stupid, brutish, and/or unkind. And yet, as more research has been done into the lives of Neanderthals, we've found that they were actually rather advanced for their time, using tools, language, having burial rituals, and even showing signs of converting from a hunter-gatherer lifestyle to an agricultural one.
Cross-breeding almost definitely occurred between humans and Neanderthals because genetic studies show us that even in the modern era, Europeans are between one and four percent Neanderthal.
All this is to say, there is a lot more support for my personal theory that humanity both murdered and f**ked Neanderthals out of existence. As all of human history tells us, if it exists humans will try to kill it and/or stick their communal dick in it.