Problem of moral rights of nonhuman entities

Non-human entities exist on the borderline of moral concepts. Some philosophers and ethicists give them a strong moral status, while others denying them any kind of moral status at all. This disparity of thought gives rise to a philosophical question: what place should animals have in an acceptable moral system? The question of moral rights of non-human entities is an issue presented in philosophy from the beginning. This article is not giving the answer but want to present various ideas on that issue