If the result holds up, belugas join a remarkably short list. The mirror self-recognition test (MSR) has been passed, with varying degrees of confidence, by humans (starting around age two), a handful of great apes (chimps, bonobos, orangutans, and—somewhat contentiously—gorillas), Asian elephants, bottlenose dolphins, probably magpies, possibly orcas, and, if you can believe it, a cleaner wrasse. That’s it. No dogs, no cats, no monkeys. Plenty of species we had assumed were self-aware have been tested and failed. //

So what is this test, exactly, and what is it supposed to tell us?

The procedure is this: While the animal isn’t looking, researchers place a mark on a spot [on the animal] it can only see via a reflection. A mirror is then put in front of the animal while the researchers watch. If the animal touches or examines the mark while looking at its reflection, it comprehends that the figure in the mirror is itself. The test is intuitive and easy to perform—and almost no species passes.

Why is this a test of self-awareness in the first place? The logic, going back to the psychologist Gordon Gallup (who invented the test in 1970), is that to use a mirror as a tool for inspecting your own body, you need a mental representation of yourself as a distinct entity. A piece of silvered glass, in this telling, can pry open a lot of cognitive doors.