Some of the other tests that Kohler is known for are preserved on film. In a typical

sequence, a chimp jumps fruitlessly at bananas that have been hung out of reach. Usually,

after a period of unsuccessful jumping, the chimp apparently becomes angry or frustrated,

walks away in seeming disgust, pauses, then looks at the food in what might be a more

reflective way, then at the toys in the enclosure, then back at the food, and then at the

toys again. Finally the animal begins to use the toys to get at the food.