Speciesism (bd77fe18)

Speciesism names the preferential moral treatment of one’s own species. In the book, the term tests the boundary between human ethical convention and evolutionary explanation: people commonly grant humans protections they deny other animals, but biological evolution does not justify that distinction. The argument does not prescribe a replacement moral code; it separates what people ought to value from what natural selection explains.

Human moral boundaries

The preference for one’s own species appears in ordinary judgments about killing, food, punishment, and legal protection. Killing people outside wartime is treated as an especially grave crime, while eating animals is widely accepted; even eating human remains is more strongly forbidden. People may oppose executing human criminals yet accept the killing of animal pests, and some animals are killed for recreation. These contrasts show how sharply moral consideration can change at the species boundary.

The comparison between a human fetus and an adult chimpanzee makes the boundary especially stark. The fetus has no more human feeling than an amoeba, while a chimpanzee can feel and think and may, according to experimental evidence cited in the book, learn a form of human language. Nevertheless, the fetus receives far greater reverence and legal protection simply because it belongs to the human species. The contrast concerns the basis on which rights are assigned, not a claim that the two are alike in every respect.

The term and its limits

The book identifies Richard Ryder as the source of the term “speciesism” and asks whether this ethic can be put on a more logical footing than racism. It does not settle that question. Its more definite conclusion is that speciesism has no proper basis in evolutionary biology: the fact that people favor humans morally does not establish that natural selection operates for the good of humanity, or that species membership supplies a biological warrant for unequal concern.

That distinction is part of a wider caution against treating evolutionary descriptions as moral instructions. The book argues that successful genes tend toward ruthless selfishness, while under particular circumstances gene-level success can also favor limited altruism among individual animals. These are claims about how selection works, not recommendations for human conduct. The evolutionary account therefore cannot be used to turn existing human preferences into moral obligations.

Kinship, altruism, and biological explanation

The discussion of speciesism sits beside a broader dispute about where altruism should be expected. Human ethics may extend fellow feeling from family to nation, race, species, or all living things; biology faces a parallel question about whether selection acts at the level of individuals, groups, or genes. The book challenges the idea that altruism evolved simply for the good of a species or group, and instead explains within-family aid through genetic relatedness.

On this account, care for a relative can benefit copies of genes shared between the individuals. Parental care is therefore a special case of kin altruism, not a uniquely privileged genetic relationship: an adult is related to a child and a sibling by the same average proportion, one half. Such explanations describe the conditions under which behavior can spread; they do not establish which beings deserve moral consideration. Biological kinship and ethical concern remain distinct questions.

The distinction also matters when kinship is inferred from behavior or custom. Humans identify relatives through names, marriage, written records, memory, family duties, and ritual; cultural ideas of kinship are not identical to genetic relatedness. The book interprets practices such as ancestor worship, family obligations, blood-feuds, and inter-clan warfare in relation to kinship, while distinguishing the incest taboo from altruism: it suggests that the taboo is presumably connected to the harmful effects of recessive genes in inbreeding. These social rules show how human relationships are organized, but they do not supply an evolutionary justification for species-based moral privilege.

Evolutionary rules and apparent exceptions

The book also asks how animals could behave in ways that indirectly benefit relatives without consciously identifying kin. A simple rule favoring individuals who physically resemble oneself might, on average, benefit relatives, though it could misfire when circumstances change or when groups become larger. The proposed connection between such a tendency and racial prejudice is presented as a possibility, not as a moral defense of prejudice. In each case, a rule that could have an evolutionary effect is not thereby an ethical rule people ought to follow.

Adoption illustrates the same difference between an appearance of altruism and its possible evolutionary consequences. An adopting female may care for an orphan who is not a relative, apparently investing time and energy without benefiting her own genes. The book treats many such cases as possible misfires of an inherited rule, while acknowledging that the evidence may be uncertain. In another reported case, a bereaved monkey mother steals another female’s baby and cares for it; the book calls this a particularly difficult example and says it warrants research into how often it occurs, the adopter’s likely relatedness to the infant, and the biological mother’s response. Such cases complicate a simple account of behavior but do not turn species preference into a principle of evolutionary biology.

Ethical significance

Speciesism’s force in the argument is diagnostic: it makes visible the inconsistency between human moral concern and the biological account of selection. The book does not claim that evolutionary theory dictates equal concern for every species, nor does it provide a complete ethical theory. It argues more narrowly that human preference for humans cannot be grounded in evolutionary biology. Its recurring separation of explanation from advocacy prevents the description of gene-level selection from being mistaken for a moral endorsement of selfishness or of any existing hierarchy of concern.