Self-destructive behavior performed for the benefit of others in the colony: Catherine read about altruism as an action by an animal that is not favourable for itself, or could even be dangerous, but improves the situation of another of its species.

Apparently a self-sacrificing behavior performed by one creature for the benefit of others: Altruism> can be an instinctive act or behavior that is harmful to one living form of life but encourages the survival of its genes, as by helping or being beneficial to its relatives.

A devotion to and regard for the interests or welfare of others. (1)

Behavior which helps other members of a species but which diminishes an individual's own chance of reproductive success: Biological altruism can be seen in species with elaborated social organisations like ants, termites, and bees.