Mirror test suggests elephants are self-aware

"Doing things in front of the mirror: that spoke volumes to me that they were definitely recognizing themselves," said Janine Brown, a research physiologist and elephant expert at the Smithsonian National Zoological Park in Washington. She was not connected with the study but expressed interest in conducting follow-up research.

Gordon Gallup, the psychologist who devised the mark test in 1970 for use on chimps, called the results "very strong and very compelling." But he said additional studies on both elephants and dolphins were needed.

"They really need to be replicated in order to be able to say with any assurance that dolphins and elephants indeed as species are capable of recognizing themselves. Replication is the cornerstone of science," said Gallup, a professor at the State University of New York at Albany, who provided advice to the researchers.

The three Bronx Zoo elephants did not display any social behavior in front of the mirror, suggesting that each recognized the reflected image as itself and not another elephant. Many other animals mistake their mirror reflections for other creatures.

That divergent species such as elephants and dolphins should share the ability to recognize themselves as distinct from others suggests the characteristic evolved independently, according to the study.

Elephants and mammoths, now extinct, split from the last common ancestor they shared with mastodons, also extinct, about 24 million years ago. In a separate study also appearing this week on the scientific journal's Web site, researchers report finding fossil evidence of an older species that links modern elephants to even older ancestors.

The likely "missing link" is a 27 million-year-old jaw fossil, found in Eritrea.

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