While there are "academic" questions about animal self-awareness, there also are some very important practical reasons to learn about animal selves. Achieving reliable answers to questions about animal selves is very important because they're often used to defend the sorts of treatment to which individuals can be ethically subjected. However, even if an animal doesn't know "who" she is, this doesn't mean she can't feel that something painful is happening to her body. Self-awareness may not be a reliable test for an objective assessment of well-being.
So, do any animals, when looking at themselves, hearing themselves, or smelling themselves, exclaim "Wow, that's me"? Do they have a sense of "I-ness?" We really don't know, especially for wild animals. It's time to get out of the armchair and into the field. Speculation doesn't substitute for careful studies of behavior.
Some people don't want to acknowledge the possibility of self-awareness in animals because if they do, the borders between humans and other animals become blurred and their narrow, hierarchical, anthropocentric view of the world would be toppled. But Darwin's ideas about continuity, along with empirical data and common sense, caution against the unyielding claim that humans and perhaps a few other animals such as other great apes and cetaceans are the only species in which some sense of self has evolved.
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