From Science (click the image to the left for the full story) a short piece about the wisdom of not being too rational:
A thirsty crow comes across a pitcher partly filled with water but can’t reach the water with his beak. So he keeps dropping pebbles into the pitcher until the water level rises high enough. A new study finds that both young children and members of the crow family are good at solving this problem, but children appear to learn it in a very different ways from birds.
Organikos 
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