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My favorite example of tool use in birds is this video http://www.youtube.com/watch?v=OYZnsO2ZgWo of a crow that actually bends a piece of wire to form a hook. There are some details about it here: http://news.nationalgeographic.com/news/2002/08/0808_020808_...

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I don't feel like opening up that video now but I believe it is from a documentary that also showed that crows are capable of grabbing one tool (a short stick) in order to reach ANOTHER tool (a longer stick) which finally helped the crow reach the food. They also showed how crows are able to remember faces and also transfer the knowledge of which face to be wary of to their young. Really fascinating stuff.

Have you seen this one: http://www.youtube.com/watch?v=BGPGknpq3e0&feature=relat...

Where a bird uses cars and a crosswalk to crack nuts.

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