Self-recognition, it has been argued, is a hallmark of advanced cognitive abilities in animals. It was previously thought that only the usual suspects of higher cognition—some great apes, dolphins, and elephants—were able to recognize their own bodies in a mirror. In this week's issue of PLoS Biology, psychologist Helmut Prior and colleagues show evidence of self-recognition in magpies—a species with a brain structure very different from mammals.
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