Sentience- the ability to feel, perceive or be conscious, or to have subjective experiences.
If an organism is sentient then by default is capable of suffering which under our current beliefs (post-enlightenment) enables one to certain rights such as unreasonable suffering. (While it is a hotly debated topic on whether some modern animals are sentient or not, let's just assume for the sake of the question that they are not able to feel emotional pain on a human level.) *It is also worth nothing that physical pain and emotional pain is something that is completely different when determining sentience. It is the emotional pain that ultimately determines it.
Picture a world of life forms that are fully functioning and fully capable of feeling emotional pain. They also possess a competitive intellect close to man kind. Since we all need energy to live and survive, would it just become how the animal kingdom is currently? A "survival of the fittest?" Would we be deadlocked in years of wars with other beings until one became dominant? Is it only that we are the dominate species that we form these principles which we consider "proper?"
-Not looking for anything much here, I just wanted to pose a question I thought interesting.