Well this is what my cat does with the mirror, usually she doesn't care one way or another, she can lie in front of the mirror and it doesn't phase her.
However, if for example I have a toy, I can stand behind her (while she is facing the mirror and looking at it), waive the toy around as if I want to play with her and she will turn around and start playing with the toy (she does not attack the mirror).
I beleive she is aware that the mirror is only a reflection, but I'm not entirely sure what that proves.
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