The Nature of Rights

So where do rights come from?  You may feel in your gut or have learned that each person has certain rights, but where do they come from?  Are they granted by Gods?  Are they granted by governments?  In my logical analysis; although God may have created nature, nature is the thing grants us rights; not God directly.  This is to say, the position of God on rights is vague, it all depends to whom you speak.  Where as nature has made it clear; in a state of nature each person has the right to their own body and the fruits of their labour.  In other words, property rights extending from the right of self ownership.

Then where does the right to free speech come from?  Well; your vocal chords are part of your body, therefore you can say what you want.

Then where does the right to free press come from?  Well; as long as you own the press or have permission to use it, that is an extension of your voice.

Then where does the right to religion come from? It is your mind and your body, do with it as you wish.

Then why is (stealing, murdering, beating...) wrong; because you have a right to your body, since it is property, and those whom harm your property are can be persecuted.

So why don't animals have this same right?  The key to human ability to have rights is based on the fact that humans as a species can understand rights.  If anyone can prove that another species understands t not only the benefit, but also the consequence of rights; then I will gladly grant that species rights.