Specifically, in this test, a few stones are placed on the top of the tube. When the bear accidentally pushes this rock down, it needs to notice that the water in the tube rises. After this test, they will do the second test, with rocks placed on the ground. Are they smart enough to pick up rocks in the jar.
Out of a total of 8 animals tested, 2 were able to pick up stones to drop the jar and get food. But there is one more tricky, he kicked the bottle to let the marshmallow to float out, so he didn’t have to go and pick up stones to do the work. In previous experiments with birds, no one has devised this method.
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