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        Part of Nature
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        Nature | Ravens: Testing Intelligence

        Ravens have been long recognized as one of the most intelligent birds. In this video segment from Nature, zoologist Bernd Heinrich of the University of Vermont puts these clever creatures to the test in an experiment that determines if they can learn to distinguish between strings bearing food and strings bearing rocks, and modify their behavior based on their understanding.

        This video is available in both English and Spanish audio, along with corresponding closed captions.

        Learn more about the Nature film "Ravens."

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