Los Angeles Times columnist Steve Lopez changes his mind about the value of "super-intelligent mammals performing circus tricks for us humans." Relevant background reading would include Dale Jamieson's essays, "Against Zoos," and "Zoos Revisited," in his book, Morality's Progress (New York: Oxford University Press, 2002): 166-189.
Finally, the indispensable online Stanford Encyclopedia of Philosophy is beginning to cover subject matter from Indic religio-philosophical traditions which are of course dear to my own heart. Nevertheless, if you have a philosophical temperament and are interested in learning more about these worldviews, I suggest spending time with the following entries: Analytic Philosophy in Early Modern India, Nāgārjuna, and Śāntaraksita. The Internet Encyclopedia of Philosophy also has entries on significant concepts, doctrines and figures from Indic worldviews.
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Cross-posted at ReligiousLeftLaw.com (Perhaps some readers would also be interested in my post on 'Spirituality, Religion, and Philosophy' at this blog.)