There was a great episode of PBS' Nature on corvids' cognitive abilities and tool use: http://www.pbs.org/wnet/nature/ravens-discover-the-brainpower-of-the-bir

There was a great episode of PBS' Nature on corvids' cognitive abilities and tool use: http://www.pbs.org/wnet/nature/ravens-discover-the-brainpower-of-the-bird-in-black/1507/ http://www.pbs.org/wnet/nature/ravens-discover-the-brainpowe...