Nonhuman persons

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Nonhuman persons are entities which are not Homo sapiens but still qualify as a person. In common parlance, the words "human" and "person" are used interchangeably, because, for the most part, every human being is a person, and there don't appear to be any nonhuman persons in existence. However, I think that there are three different categories of entities that are not humans, but are still people. All three categories seem possible but don't appear to exist, so I will give examples from fiction.

Intelligent Aliens

While there is no credible evidence of life on other planets, let alone intelligent life, there doesn't appear to be anything special about the formation of life on Earth that would prevent it form springing up on other planets as well (a process called abiogenesis). If we were to meet an extraterrestrial life form, and it were sufficiently intelligent, it would be proper to call it a person even though it is clearly not a human.

Examples of nonhuman alien persons from fiction include Chewbacca from Star Wars, the Na'vi from Avatar, and E.T. from E.T. the Extraterrestrial.

Artificial Intelligence

Computer scientists have only been working on artificial intelligence (AI) for a couple decades, but already they have created some very impressive programs. Currently, AIs can be designed to perform pretty much any task a human can do, only vastly better. However, nobody has been able to create an AI that can even pass a Turing test, let alone demonstrate consciousness. Nonetheless, scientists keep churning out better AIs all the time, and, since there doesn't appear to be anything supernatural about the human brain, an artificial consciousness should be possible. If that happens, the AI will not only be a nonhuman person, but will also become the first nonliving person.

Examples of artificial intelligence persons from fiction include Data from Star Trek: The Next Generation, the replicants from BladeRunner, and Marvin from The Hitchhiker's Guide to the Galaxy.

Evolved Animals

Complex consciousness appears to have only evolved a single time on Earth in our human ancestors. Some anthropologists argue that the more intelligent animals like chimpanzees and dolphins have a limited consciousness, but it is not to the level of humans. However, there doesn't appear to be anything to prevent a species that currently doesn't have consciousness from evolving into one that does. Given our current understanding of genetics and our propensity for breeding, humans may one day even create a nonhuman with consciousness. Evolved animals are essentially the same as intelligent alien life, only they would have formed on Earth based on the terrestrial foundations of life (DNA, eukaryote cells, etc.) rather than a totally alien foundation of life.

There are fewer examples of nonhuman animal persons in fiction, but it is a sub-genre called uplift. The most popular example I can think of are the apes from Planet of the Apes.