In biology, the idea that altruism shown to
genetic relatives can be worthwhile, because
those relatives share some genes with the
individual that is behaving altruistically
and may continue to reproduce. See inclusive
fitness. Alarm-calling in response to
predators is an example of a behaviour that
may have evolved through kin selection:
relatives that are warned of danger can
escape and continue to breed, even if the
alarm caller is caught.