Abstract: Nine wild rhesus monkeys from Yunnan Province,aged 1.5 to 2.5 years,were first trained to discriminate between solid objects,and then,testedwith their photographs.Two pairs of objects were used at the presentexperiment.They were (1) wooden house(+) vs.wooden ink bottle(-)models,and (2) circular cone (+) vs.spheroid (-).All objects werepainted with grey paint.The photographs,with their background cut off,were painted with the same color as the objects. The result showed that the animals transposed their discriminationresponses from solid objects to their photographs,and that the elder ani-mals learned to discriminate between objects faster than the youngerones.

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