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Animal intelligence — Audiobooks
Ways of Nature
by John Burroughs
Clever Hans (The Horse of Mr. Von Osten)
by Oskar Pfungst
Lola; Or, The Thought and Speech of Animals
by Henny Kindermann
Animal Intelligence
by George John Romanes
Animal Behaviour
by C. Lloyd (Conwy Lloyd) Morgan
Animal intelligence: Experimental studies
by Edward L. (Edward Lee) Thorndike
Intelligence in Plants and Animals
by Thomas G. (Thomas George) Gentry
The Mental Life of Monkeys and Apes: A Study of Ideational Behavior
by Robert Mearns Yerkes
Animal Life and Intelligence
by C. Lloyd (Conwy Lloyd) Morgan