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Think your children are bird-brains? You're right - our feathered friends outperform 7-year-olds in logic tests
In a logic test, Eurasian jays quickly learned that adding stones to a cylinder half-filled with water would bring a tasty treat floating on the surface within reach of their beaks. In a second task the jays realised it was better to use pebbles, which sink, than corks, which float.