Here are links to research by Dr. Marzluff of University if Washington. He studies long-term face recognition in Crows. (the so-called friend or foe study done in downtown Seattle) It seems to have relevance to the current discussion. http://www.cfr.washington.edu/spotlight.shtml http://www.nytimes.com/2008/08/26/sc...crow.html?_r=2

something to think about

-- Scott