He who makes a beast of himself gets rid of the pain of being a man Samuel Johnson

I am going to argue that we share many characteristics with primates and if we try to understand ethics in humans, we should consider if it would apply to our (distant) cousins.

Humans share a common ancestor with various other primates*. Our genetic design is 99% shared with the chimpanzee genome and 97% with the rhesus monkey. Our brains are relatively large compared to our body size, especially compared to other primates. I don’t mean to imply that a human has a directly scaled design from our common primate common ancestor (we don’t), but it has many similarities.

You have made your way from worm to human, and much in you is still worm. Once you were apes, and even now a human is still more ape than any ape. NSZ, Nietzsche

Our common ancestor with primates live around 85 (or 65?) million years ago. Humans seem to have be around for 100,000 years. We are distant cousins in a literal sense from all primates. (In fact we are probably related to all living things! but that is a broader topic.) A thought experiment which was proposed by someone but annoyingly I can’t locate the source (Dawkins?) went: Imagine if a species between us and Chimpanzee survived? Perhaps a tribe of Neandertals was discovered… What then? Would they be given human (homo sapien) rights?

Many ethics systems have the rule “do not kill” (Exodus 20:12, Quran 5:32). But where do we draw the species line? On 4th cousins perhaps? :) There is often no guidelines. Should we draw it at the species line?

Most textbooks define a species as all the individual organisms of a natural population that generally interbreed at maturity in the wild and whose interbreeding produces fertile offspring Wikipedia

The definition of species (which is itself a complex matter) would seem to be an arbitrary standard! The rule could be restated as “do not kill any creature that can interbreed with you”. Nice :) I think we do need a point we can kill things for food (I am personally an omnivore) but I hope to highlight this ambiguity. (Animal murder is touched upon in the novel Do Androids Dream of Electric Sheep?)

Looking at our behavior, we have many behaviors in common and additional skills primates can learn from humans. Examples:
Currency, Gambling, Prostitution(!)
Spoken Language (Listening and limited speaking), Sign language
Altruism, tendancy for social conformity, capacity for self-awareness, tool use (or was that just a movie?! lol no it’s real).

(In one study, there was evidence found that even fruit flies have free will – which I find slightly questionable since we cannot say if free will exists!)

Humans do have more mental functions in some areas than other primates. Large brains can handle increased social group sizes which some think is the driving factor for big brains. Arguably, we have a complex culture with highly abstract concepts. We have language with lots of words. (which I am beginning to think is non-central to ethics/truth/good/evil.. more on this when I can develop the idea – if I dare) We have philosophy, which other animals don’t seem to have(?).

A thought popped into my head: if anyone thinks a chimp is not developed enough to understand truth, ethics, culture – can they provide evidence that humans have a significant advantage over a chimp to grasp these things?….. I don’t think so :) Is understanding linear with “brain size”?

Remember, there is no reason to think we have stopped evolving. Incidentally, it is sometimes addressed in sci-fi (2001, B5, X-Men). Wacky Nietzsche embraces this and declares it “the meaning of the earth” – although he was focusing on ethical evolution not eugenics. In some ways, we are taking the reins of evolution with use of medicine (which alters evolutionary pressure) and offspring genetic screening.

What is the ape to a man? A laughing-stock, a thing of shame. And just so shall a man be to the Superman: a laughing-stock, a thing of shame. NSZ, Nietzsche

To sum up I ask:
1) Does ethics apply to chimps as well as us? Are they moral beings with good actions and evil actions?
2) Can we kill other animals who are all in fact literally our cousins? (Do I have to become a vegetarian – or are they distant relatives? *checks science book* D’oh! looks like we murdered that carrot!)
3) Does our brain development over other primates give us a significantly improved understanding of anything?
4) What will replace homo sapien? What will our species be condemned for?

*Note: this discussion assumes we have descended from a common single celled ancestor. The mechanism (often thought of as natural selection by Darwinists) is not necessarily assumed.