- Darwin, Charles, 1809-18822
- Rawls, John, 1921-20022
- Singer, Peter, 1946-2
- Animal Defence and Anti-Vivisection Society1
- Aristotle1
- Cigman, Ruth, 1951-1
- Cohen, Carl, 1931-1
- Descartes, Rene, 1596-16501
- Frey, R. G. (Raymond Gillespie)1
- Gandhi, Mahatma, 1869-19481
- Hopkins, Gerard Manley, 1844-18891
- Hume, David, 1711-17761
- Ramon, Brother, SSF1
- Royal Society for the Prevention of Cruelty to Animals1
- Tolstoy, Alexandra, 1884-19791