Gorillas are another good example: for many years, nobody thought gorillas could pass the mark test. Turns out, the test was just very uncomfortable for them. Eye contact is a thorny social issue for gorillas, often leading to fights, several researchers said. More than that, gorillas are easily embarrassed, says Robert Mitchell, foundation professor of psychology at Eastern Kentucky University. Instead of messing with the mark in front of the mirror, they would sometimes go away, hide in a corner, and wipe the mark off there. Gorillas got what was going on, they just didn’t respond the way we thought they should.

http://www.scientificamerican.com/article/kids-and-animals-who-fail-classic-mirror/

oh noooooooooooooo