Books about Animal intelligence
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Animal Behaviour
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Animal Life and Intelligence
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Clever Hans (The Horse of Mr. Von Osten)
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Ways of Nature
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Intelligence in Plants and Animals
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Animal Intelligence
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Animal intelligence: Experimental studies
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Lola : or, The thought and speech of animals
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The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
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The intelligence of invertebrate animals