Elephant seals

Elephant seals appear in the book as an example through which two arguments about evolution become concrete: the costs and benefits that shape aggression, and the limits of explaining animal populations by what seems useful to the species as a whole. Their large harems make victory valuable enough to help explain dangerous fights, while the unequal distribution of observed copulations reveals why a surplus of nonbreeding males can look wasteful from a group perspective without being paradoxical from a gene-centered one.

Combat and reproductive stakes

The prospect of taking a harem turns a challenge into a high-stakes contest. The book asks the reader to consider the challenger’s calculation: killing a male who possesses many females might bring substantial reproductive opportunity, but the holder is likely to be a formidable opponent, perhaps one who has already defeated previous challengers. A fight can leave either animal dead or so badly injured that the victor cannot benefit from the prize; it also consumes time and energy that could be spent feeding and growing stronger. Waiting may therefore improve a challenger’s eventual chances, even when the resource remains worth contesting.

This cost-benefit framework connects elephant-seal aggression to evolutionary game theory. A contest is not simply a direct measure of which animal would benefit from fighting: the prospective reward, probability of injury, time spent, and opponent’s capacity to retaliate all matter. The book contrasts the seals’ unusually valuable prize with the situation of a small bird feeding nestlings, for which lost time may be especially costly. The contrast shows why the same general logic of strategic aggression can produce different patterns under different ecological stakes.

Unequal mating success

The book cites a study of elephant seals in which four per cent of the males accounted for 88 per cent of the copulations observed. The figures make sharply visible the concentration of mating success: a small fraction of males obtained most of the observed copulations, while many bachelor males apparently never copulated during their lives. Yet those males otherwise lived normal lives and consumed food as hungrily as other adults.

Viewed as a calculation for the species, this surplus can seem wasteful. Since one male could theoretically produce enough sperm to service a harem of 100 females, the nonbreeding males might appear expendable, or even like social parasites competing for resources without reproducing. The example is used to expose the difficulty of group-selection reasoning: a population-level description of waste does not itself explain why the population contains those males.

What the example explains

The elephant-seal cases support different parts of the book’s argument and should not be mistaken for a single direct demonstration. The harem illustrates why the payoff for winning may be high enough to accompany vicious fights and serious injury; the mating statistics illustrate how reproductive success can be unevenly distributed while the number of males remains substantial. Together they distinguish the interests of a species, considered as a whole, from the selection pressures affecting individuals and genes.

The book presents these observations as examples within a broader theoretical argument, not as proof that every detail of elephant-seal behavior has been experimentally resolved. Their force is comparative: a costly, dangerous fight makes sense when the prize is a near-monopoly over a large harem, while the apparent waste of surplus males becomes a challenge for explanations based solely on the good of the species. The same animal thus clarifies both the stakes of competition and the limits of judging reproductive arrangements by collective efficiency.