There are some scientific speculations on why modern humans are the only human species alive. There were others, like the Neanderthals. However, when modern humans arrived in Europe about 40,000 years ago, they soon took over. The Neanderthals had lived in Europe for about 200,000 years, but could not compete with the early forefaghers of modern day humans.
I have a theory myself on what made the present human species the one that survived all others. Humans had dogs. It was about 40,000 years ago that wolves teamed up with humans, eventually becoming dogs. Humans and dogs hunted much more efficiently together than they had done by themselves. dogs are also great at guarding the joint human-dog homes. These factors could have helped modern day humans becoming the only human species alive. Dogs could have helped doing this.
It is just a theory, but it is not improbable, is it?
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