Pigeons can tell the difference between a painting by Monet and Picasso.

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In a 1995 study published in the Journal of Experimental Analysis of Behavior, researchers reported being able to train pigeons to discriminate between paintings by Claude Monet and Pablo Picasso when shown slides of their works that they had previously never seen before. When the Picasso images were inverted, the little art connoisseurs could still tell it was a Picasso. Maybe that's why they like landing on statues so much.