For some species, aiding in the rearing of siblings in a group rather than reproducing on your own is the best way to ensure that an individual's genes are passed on to the next generation.

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This is a form of social behavior known as cooperative breeding, which is observed in several species such as meerkats, naked mole rats, and African wild dogs. In these species, individuals forego their own reproduction and instead help care for the offspring of their relatives, increasing the survival and fitness of the entire group, including their own genetic contribution.

For Some Species, Aiding in the Rearing of Siblings in a Group