Having recently read Rothbards The Ethics of Liberty. I find myself hung up on one part of it. It seems that people of the Rothbard line, such as Walter Block, hold that animals have no rights since they aren't human. I understand their point. But my question is a serious one. What makes us Human? I've struggled with this for quite some time. What about us as humans makes us deserving of certain 'inalienable' rights? Is it because we demonstrate free will and an ability to reason above base instinct? Certain animals can do that. Is it because we demonstrate problem solving techniques? Well various animals demonstrate that. The way I see it, if our humanity is based on the fact that we are able to vocalize it, could we not then reserve the right of humanity to humans that speak the same language as us? If we do not extend our rights to animals because they can not vocalize their will to us, that puts them, at least in my mind, in the same category as any human that speaks a different language.
I would love your thoughts on this. What makes us 'Human'?