@bns, guess i missed that word.
@Ilya: Of course thought about evolution causing psychology. I was not sure about it, for one to say evolution had a role it in one must consider where in natural selection it is advantageous. As individuals, it might be advantageous in recognizing parents, but that is only a single layer. Respecting whole other species it not useful for that. As species-selection, i doubt that one species actively helps another, so similarity-respect in that selection helps very little. Then there is the hurding behavior or different animals. Problem with that that we also respect predators. My conclusion is that the cause is not evolution, at least not in those simple ways.

Getting back to topic: Can we get more general ways of determining rights and importance thereof? The only ones i can think of is seeing what they do when given oppertunities, what we naturally associate, and making analogies with that. And when we get to trying to define rights/weights of specific animals what kind of things should we talk about?