Books about Psychology, Comparative

The Dawn of Reason; or, Mental Traits in the Lower Animals

Zoölogische Philosophie (Dutch)

The Expression of the Emotions in Man and Animals

Animal Life and Intelligence

Mental Evolution in Man: Origin of Human Faculty

Clever Hans (The Horse of Mr. Von Osten)

Intelligence in Plants and Animals

Animal intelligence: Experimental studies

La simulación en la lucha por la vida (Spanish)

Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals

Straußenpolitik : Neue Tierfabeln (German)