Wikipedia definition
1. Altruism in animalsAltruism is a well-documented animal behaviour, which appears most obviously in kin relationships but may also be evident amongst wider social groups, in which an animal sacrifices its own well-being for the benefit of another animal.
Read “Altruism in animals” on English Wikipedia
Read “利他的行動” on Japanese Wikipedia
Read “Altruism in animals” on DBpedia


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