Well, it is not certain, you are right there. But the UNLEARNED removal of the mark hints at comparable behavior in humans: Just not liking to be seen with a mark in the face and removing it - WITHOUT external reward, as in the pigeons.
Replying to @DegenRolf @broede
And, by the way, I have written myself that not even mark removal in apes is "real" self recognition, for reasons: https://plus.google.com/101046916407340625977/posts/crgCSgXhCxn …
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