Great apes and humans have long been amongst the few species to pass the mirror test, also known as the mark test. When researchers put an ink mark on a great ape’s forehead without the ape realizing, then put it in front of a mirror, the ape can recognize that it’s looking at its own reflection and will reach up to touch the unfamiliar mark. There’s some evidence that dolphins, killer whales, Asian elephants, and magpies can do similar things, though some scientists contest the issue. Most primates can’t even pass the test. And what that’s told primatologists for years is that many species aren’t self-aware. If you can’t recognize yourself in a mirror, that means you don’t have a sense of self. But what if we just weren’t testing those primates properly?