What is the smartest bird in the world?
You have probably heard about the New Caledonian Crow, which is one of the few animals to have been shown to manufacture tools, rather than just use a useful shaped staff that it finds around. Such a crow has been seen to bend a piece of wire into a hook in order to fish food out of a jar. This is regarded as far more intelligent behavior than has been seen by any other bird, or indeed by any animal other than the primates.
See the related link below, or search the web for New Caledonian Crow.