Pigeon Intelligence

Researchers studying pigeons have learned that they can read all of the letters of the alphabet and they read them in a way similar to people. Scientists became convinced that pigeons see the world in much the same way as we do when they discovered that pigeons tend to confuse the very same letters that people do. What’s more, it took only four months for pigeons to learn to distinguish all the letters of the alphabet. For years pigeons have been used to spot and reject defective items on assembly lines, where they have better records than human beings.

(Meer op http://en.wikipedia.org/wiki/Pigeon_intelligence)