Red Dragon  wrote or quoted:

> I was wondering if parrots could be the most intelligent of all the birds
> since it could imitate human speech. [...]

``So what are the world's most intelligent birds? Woodpeckers 
  rank high in the bird intelligence pecking order. As an 
  example of their innovation, take the gila woodpecker found 
  in the south west USA and Mexico that fashions a wooden 
  scoop out of tree bark to carry honey home to its young. 
  Also high in intelligence are birds of prey (e.g. hawks, 
  eagles and falcons). Bald eagles in northern Arizona have 
  discovered that dead minnows lay frozen under the surface of 
  ice-covered lakes. On lakes where the ice is thin, eagles 
  can be found chipping holes in the surface. This alone is 
  not enough to earn them their meal however; the eagles then 
  jump up and down on the surface of the ice, using their body 
  weight to push the minnows up though the holes. The most 
  intelligent bird group according to Lefebvre's research are 
  crows. The Japanese carrion crow exhibits a remarkable 
  behaviour that demonstrates why this bird is at the top of 
  the "bird brain" charts. At a university campus in Japan, 
  carrion crows have developed a unique feeding innovation 
  that exploits human technology. Carrion crows perch at 
  traffic intersections and patiently wait for the red light. 
  When the vehicles come to a stop, the crows spring into 
  action - they fly down to the cars and place walnuts under 
  the tyres. These crows are smart enough to have figured out 
  that the simplest way to open a nut is to get someone else 
  to do it for you!''

 - http://www.spark.mcgill.ca/ianbirds.htm
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