Bee

Honey bees are among the book’s central examples of how apparently self-sacrificing behavior can be analyzed without attributing conscious motives to genes or treating the welfare of a species as evolution’s goal. A worker may die defending the colony, and workers may remove infected larvae through a complex hygienic routine; the book uses these cases to distinguish behavioral observation from evolutionary explanation. It also presents the honey bee colony as a highly coordinated society whose sterile workers and reproductive members raise questions about how genes persist through relatives rather than through an individual’s own offspring.

Defense and apparent altruism

A honey bee worker’s sting can provide an effective defense against honey robbers, but the worker that stings usually dies soon afterward. The colony may thereby retain its vital food stores, while the individual worker does not survive to benefit from that protection. Under the book’s definition, this is an altruistic act at the level of individual behavior: one animal incurs a cost that benefits others. The definition does not depend on whether the bee has a conscious intention to sacrifice herself. Conscious motive is explicitly set aside, both for this example and for apparently selfish acts.

The case is introduced as an illustration, not as evidence for a general law. The book cautions that chosen stories do not establish broad evolutionary generalizations. Its larger claim is that both individual selfishness and individual altruism can be explained through gene-level selection, including circumstances in which a gene’s persistence is advanced by behavior that appears costly to the animal displaying it. This distinction prevents the worker’s death from being treated as proof that evolution has selected for the good of the species as a whole.

Foul brood and hygienic behavior

Honey bees also feature in a more detailed account of inherited behavior. Foul brood is an infectious disease that attacks grubs in their cells. Some domestic strains used by beekeepers are more vulnerable than others; the difference, in certain cases, is associated with whether workers perform a hygienic routine. Workers in hygienic strains locate infected grubs, remove the wax cell caps, pull out the larvae, carry them through the hive entrance, and discard them. Susceptible strains do not carry out this sequence and are vulnerable to the disease’s spread.

W. C. Rothenbuhler examined the inheritance of the behavior by crossing a queen from one strain with a drone from another and observing the daughter workers. Worker bees ordinarily do not reproduce, so the crosses had to be made through queens and drones rather than by breeding workers. All the first-generation hybrid daughter hives proved non-hygienic. The apparent disappearance of the hygienic behavior did not mean its hereditary basis had vanished: the account explains that the relevant genes remained present but were recessive.

When Rothenbuhler back-crossed the first-generation hybrids with a pure hygienic strain, the resulting daughter hives fell into three behavioral groups. Some showed the full routine, some showed none, and an intermediate group uncapped the cells but did not remove the larvae. Rothenbuhler inferred that the two parts of the sequence could depend on distinct genes: one associated with uncapping, the other with throwing out the infected grub. The intermediate bees made the separation visible, since they performed the first action without completing the second.

The apparently non-hygienic group yielded a further test of that interpretation. Rothenbuhler manually removed the wax caps from cells. Half of the bees that had seemed wholly non-hygienic then displayed the throwing-out behavior. By supplying the condition normally produced by uncapping, the intervention revealed a behavior that the bees could perform but did not ordinarily reach on their own. The result supported the proposed distinction between the two steps rather than treating hygiene as one indivisible trait.

Genes, behavior, and cooperation

The experiments illustrate why the book uses expressions such as a gene for uncapping or a gene for throwing out larvae without claiming that a gene single-handedly constructs a complex behavior. A gene’s effect may operate through a long developmental chain, potentially including learning. The book offers a possible mechanism for uncapping: a gene might make bees find infected wax rewarding, so that they tend to repeat the behavior. Whether or not that mechanism is correct, the phrase gene for uncapping is meaningful in the restricted sense that, other things being equal, bees with the gene tend to uncap while bees without it do not.

The two proposed genes also demonstrate cooperation among genes in producing behavior. The throwing-out action is ineffective if the cap remains in place, and uncapping alone does not complete hygienic removal. Their useful effects therefore depend on one another. Yet Rothenbuhler’s results suggest that they remain separable in inheritance: they can be treated as a cooperating unit in their work while remaining distinct agents as they pass through generations. The example supports the possibility of genetic influences on behavior without reducing every movement, sensory process, or possible learned component to the action of a single gene.

Colony life and worker sterility

The honey bee is presented as one member of the social insects, alongside wasps, ants, and termites. Their colonies display striking cooperation, including the workers’ defensive stinging. In the honey-pot ants, a specialized worker caste stores food in enlarged bodies and serves as a reserve for other workers. More generally, the book describes social insect colonies as sharing food and information so extensively that they can resemble a single organized unit: chemical signals and the bees’ dance communicate information, while intruders are recognized and repelled and hive temperature is regulated with considerable precision.

The analogy between a social insect colony and an individual organism extends, in the account, to reproduction. Most colony members are sterile workers; the continuing line of reproduction passes through a smaller number of reproductives. Workers therefore do not generally propagate their genes by producing offspring of their own. Their behavior may instead preserve genes through care of relatives. On this reasoning, the death of a sterile worker is not equivalent, from the perspective of gene transmission, to the death of an individual that could otherwise have produced its own descendants. The analogy does not make a colony literally one organism, but it helps explain why worker sacrifice need not be an evolutionary puzzle.

The account also qualifies any simple description of honey bee reproduction. It notes that the familiar honey bee appears to invest more in males than the proposed expectations for social-insect sex ratios would suggest. Hamilton’s suggested resolution is to count the attendant workers that leave with a departing queen and help establish a new colony as part of the cost of producing reproductive females. Those workers are lost to the parent hive, so excluding their production would understate the investment associated with each queen. Including it, the book argues, makes the apparent discrepancy less serious rather than overturning the theory.

What the examples establish

The honey bee examples connect visible behavior to a broader argument while keeping different kinds of evidence distinct. The sting and the hygienic routine are illustrations of behavior; Rothenbuhler’s crosses and manual removal of cell caps provide a more specific experimental account of inherited differences and separable behavioral steps. The proposed developmental mechanism remains a possibility rather than an established description, and the book does not treat the examples as proof that every altruistic act has the same genetic basis.

Taken together, defense, disease removal, and worker sterility show why an individual-level description can mislead if it is mistaken for an evolutionary explanation. A worker’s death may benefit the hive, and a hygienic routine may protect the colony, but the book asks how the genes influencing those outcomes persist. Its answer turns on the conditions under which relatives and colony members carry shared genes, not on an assumption that bees consciously serve a collective purpose. The colony’s apparent unity is thus both a striking feature of honey bee life and a problem the gene-centered account seeks to explain.