Latest avian research. Pigeons recognize faces and differentiate some sounds. I really don't know why all this animal intellect is so suprising. Think of the monarch butterflies. Every fourth generation 'knows' how to migrate thousands of miles to the same spot as last season!
> 
> http://www.sciencedaily.com/releases/2012/06/120622163056.htm-The reason you put "knows" in quotes underlines the fact that "knowledge" may not be the appropriate word!