"Every one has seen how jealous a dog is of his master's affection, if lavished on any other creature; and I have observed the same fact with monkeys."
— Simians

January 1, 1970

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Primates
Original Language: English

Sources

Charles Darwin, The Descent of Man (1871), volume I, chapter II: "Comparison of the Mental Powers of Man and the Lower Animals", pp. 41-42