Read this article about a particular african grey that is probably the smartest animal ive seen...
http://www.alexfoundation.org/resear...d/harvard.html
Its pretty long but to sum it up, this bird can identify colors.. not only that but if its a square object, round, triangle etc... not only that he can identify matter such as plastic, wood, metal, etc.. he can identify many things such as trucks, bananas, chairs and so on. he can tell when things are same, different or similar. basically about as smart as a 2 or 3 year old kid. crazy shit.