We had taught capuchin monkeys to reach a cup of food on a tray by pulling on a bar attached to the tray.

 
  • 在那里,我们训练卡布钦猴(capuchinmonkey,译注:一种新世界猴)合作取食。放食物的杯子摆在笼子外面一个可移动的托盘上,托盘连著一根拉杆,伸进猴子笼里。
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