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Usually in this context, "self-aware" is usually used to indicate the ability to recognize one's own image, voice, smell, etc. The research referred to is mostly several experiments of showing dolphins to a mirror and determining that they can recognize a) That they are looking at a reflection, not a window, and b) They are able to distinguish themselves from other dolphins.

This only applies to one (quite narrow and literal) definition of self-awareness, mind you, but it's something you only see in apes and dolphins.

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