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Black-headed gulls appear in The Selfish Gene as an example of individual behavior that benefits the actor at another bird’s expense. In a densely packed nesting colony, a gull may seize and eat a neighbor’s defenseless chick while the neighbor is away fishing. The episode illustrates apparent selfishness, while the book cautions that such examples clarify terms rather than establish general evolutionary conclusions.

Colony Life and the Example

Black-headed gulls nest in large colonies, with nests only a few feet apart. Newly hatched chicks are small and vulnerable, making them easy prey. A gull may wait until a neighboring adult has its back turned or has left to fish, then take and swallow one of the neighbor’s chicks.

The act offers an immediate advantage: the gull gets a nutritious meal without catching a fish and without leaving its own nest unprotected. The example’s force lies in this combination of opportunity and benefit. The gull exploits the neighbor’s absence while avoiding the cost of abandoning its own young.

Apparent Selfishness and Its Limits

The episode is introduced among examples of apparently selfish behavior by individual animals. The book distinguishes an act’s apparent effect on survival from any claim about the actor’s private motive: behavior can look selfish because its consequences favor the actor, whether or not the animal consciously intends that outcome.

The gull story is illustrative, not proof of a broad rule. The book explicitly warns that selected examples are not serious evidence for worthwhile generalizations. Its purpose is to make the distinction between individual selfishness and individual altruism concrete before the argument turns to explanations of behavior through gene-level selection.

Place in the Argument

The colony scene also gives a practical counterpoint to the idea that evolution makes animals behave for the good of their species or group. Here the benefit described is local and individual: one gull obtains food by taking a neighbor’s chick. The example helps frame the book’s challenge to species-level explanations, but it does not by itself settle how such behavior evolves.

Accordingly, the gull is not presented as a character with a developed life or as evidence of conscious malice. It is part of a carefully limited example: a specific act, its immediate payoff, and a reminder that vivid natural history can illustrate a concept without proving the theory built around it.