At the New York Aquarium, a beluga named Natasha swam up to a newly installed mirror and did something unexpected. She clapped her jaws. She jerked her head. She behaved, researchers noted, as though she were facing another whale entirely.
But something was shifting. Scientists were watching closely — and Natasha’s behavior would place her among a very short list of nonhuman animals ever to show signs of recognizing themselves.
A short list with a new name on it
Mirror self-recognition, or MSR, is one of the most closely watched tests in animal cognition research. The premise is straightforward: an animal that uses a mirror to inspect its own body — rather than treating the reflection as a stranger — is demonstrating a basic form of self-awareness. Since the 1970s, scientists have confirmed this ability in chimpanzees, bonobos, orangutans, gorillas, bottlenose dolphins, Asian elephants, Eurasian magpies, and cleaner wrasse fish.
A study published May 20 in the journal PLOS One adds a new name to that list. Beluga whales, the research found, can recognize themselves in mirrors. “Belugas demonstrate a high level of self-awareness and a sense of self,” said study co-author Diana Reiss, a cognitive psychologist at Hunter College, City University of New York.
Four whales, one mirror, one camera
The study focused on four captive belugas at the New York Aquarium of the Wildlife Conservation Society: three adult females named Kathy, Marina, and Natasha, along with Natasha’s daughter Maris, who was seven years old at the time. None had prior experience with mirrors or had previously participated in cognitive studies, though they’d encountered semi-reflective windows in their pools.
The whales lived in three interconnected, above-ground concrete pools in an outdoor complex. Researchers installed a two-way mirror — reflective on one side, transparent on the other — in a window of one pool, with a camera positioned to record responses. Transparent plexiglass placed in the same location served as the control condition. Kathy and Marina showed little interest. Natasha and Maris were a different story.
From aggression to self-inspection
In their first two-hour session with the mirror, Natasha and Maris behaved as though encountering a stranger. They clapped their jaws and jerked their heads upward — social behaviors typically linked to aggression and intimidation in belugas — suggesting they initially perceived the reflection as another whale.
That changed quickly. Both whales began moving their heads in deliberate, repetitive ways: nodding up and down, tracing semicircles, shaking horizontally. Researchers describe these as “contingency testing” behaviors — probing movements designed to determine whether the figure in the mirror was copying them. By the second session, Natasha and Maris were peering into their own open mouths, watching themselves execute barrel rolls, flapping their pectoral fins in front of the glass, and blowing bubbles. This behavioral arc mirrors the progression documented in other confirmed MSR species.
The mark test: Natasha’s defining moment
The mark test is considered the gold standard of MSR research. Researchers placed temporary visual marks on parts of the whales’ bodies that could only be seen using the mirror. Maris showed no clear mirror-directed response to her marks. Natasha, however, swam repeated laps with her marked side oriented toward the mirror and at one point pressed the mark directly against the glass — behavior the researchers interpreted as purposeful self-inspection.
Those responses earned Natasha a passing grade. “We were quite excited to observe how Natasha responded to seeing the temporary visual mark,” Reiss told IFLScience. The result provided the clearest evidence yet that at least one beluga can recognize her own reflection as herself.
What self-awareness in belugas means beyond the lab
Masanori Kohda, a biologist at Osaka Metropolitan University who has studied MSR in cleaner wrasse fish, wasn’t involved in the research but found the outcome consistent with his own thinking. He has suggested that any species capable of recognizing individual members of its own kind can probably also recognize itself in a mirror. “From this perspective, the present report of [mirror self-recognition] in belugas seems quite expected,” he told National Geographic. “That said, it is of course still a valuable study.”
The finding connects naturally to what researchers already know about belugas. Highly social animals with intricate communication systems, belugas also display behaviors associated with empathy — traits that appear repeatedly among species confirmed to pass MSR tests.
The researchers have a practical motivation for pursuing this work, too. Documented evidence of self-awareness, they hope, will increase public empathy for cetaceans and support stronger global protections. Belugas face mounting pressures from fisheries, shipping traffic, oil and gas exploration, and the accelerating effects of climate change on Arctic and sub-Arctic habitats.
That a single whale named Natasha, pressing a mark against a mirror in an outdoor pool in New York, could contribute to that conversation is worth sitting with. Self-recognition may matter not just to the animal that possesses it — but to the humans deciding how much that animal’s life is worth protecting.