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Crows are one of the most common birds on the planet. They have more brain mass per unit than any other bird group except the macaw and as result they often behave more like primates or even humans than they do birds. Crows have a proven ability to reason and problem-solve and have long and dependable memories. They engage in complex social interactions that range from group play and hunting to gang-style killings and funerals.
http://www.cbc.ca/documentaries/natureofthings/2009/murderofcrows/director.html

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