http://phys.org/news/2012-09-crows-react-threats-human-like-neural.html
In my chapter CLEVER CORVIDS I describe some of John Marzluff's work on corvid cognition. He has now shown that crows recognize and respond to faces much in the same way we humans do. They are capable of perceiving a threatening mask - and remembering it - even though the individual wearing the mask does them no actual harm. Deep in the bird's brain is a structure analogous to our amygdala which is strongly involved in face recognition - and the valency of emotion in the face, and other fear reactions.