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that test is great to identify animals whos predominant sense is sight.
What is so unique about the manta having passed the test?
Birds and mammals are widely considered to be intelligent but fish (or rays if you want to be pedantic) are not.
dont forget ants. source https://www.animalcognition.org/2015/04/15/list-of-animals-that-have-passed-the-mirror-test/
Wait, the sting ray is self-aware? Mother fucker knew what he was doing when he killed Steve Irwin!