From Today's New York Times
Animal Ethics
MAY 27, 2007
But in a Darwin letter of April 3, 1880, which I have, where he thanks Georg Heinrich Schneider for sending him a copy of his recently published treatise “Der thierische Wille”—a valuable contribution to animal psychology—Darwin seems to sum up his life’s work in one sentence: “Everything about the minds of animals interests me greatly.”
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