May 26th
Born 26 May 1876; died 3 Feb 1956 at age 79.
Robert Mearns Yerkes was an American psychologist and a principal developer of comparative (animal) psychology in the U.S. In his book The Dancing Mouse (1908), he helped established the use of mice and rats as standard subjects for experiments in psychology. He also studied primates, publishing his results in 1929 in the classic book The Great Apes.
