What separates your mind from an animal's? Maybe you think it's your ability to design tools, your sense of self, or your grasp of past and future-all traits that have helped us define ourselves as the planet's preeminent species. But in recent decades, these claims have eroded by a revolution in the study of animal cognition. Drawing on extensive studies of a wide range of animals, world-renowned primatologist Frans de Waal demonstrates that we have grossly underestimated both the scope and depth of animal intelligence. (Hentet fra omslag).