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Petrus Albertus David Singer (Melbourni 6 Iulii 1946) est philosophus australianus et defensor iurum animalium, cuius libri magni sunt Liberatio animalis (1975) (Anglice Animal liberation) et Ethica facti (1979) (Anglice Practical Ethics). Alma mater sua est Universitas Melburnensis et ipse pars rediti sui ad auxilium organizationibus (etiam UNICEF) ad reductionem paupertatem.