Friend or foe, ravens recognize you

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  • Updated: April 28, 2012 - 4:29 PM

Ravens have the ability to recognize old friends and react negatively to seeing a foe, said a study in the journal Current Biology. Marcus Bockle, a University of Vienna zoologist, and his team describe a group of 12 ravens kept together for three years, then separated. Three years later, they recorded them and played their calls to one another. "If they heard a friend, then they called out in a friendly voice," he said, opposed to an unfriendly (deeper and elongated) voice.

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