This Oxford University experiment shows that New Caledonian crows are even more intelligent than previously thought. In the video a crow is shown using three tools in the right sequence to achieve an objective, without prior training.

See also:

• Joshua Klein: The amazing intelligence of crows (TEDTalks)
• Crow bends wire to get food out of jar
• Crow uses small stick to get large stick to get food

 Read more:

• Wikipedia: Crow / Bird Intelligence (Avian IQ)