The Professor Showed A Large Cage With A Male Rat.


It was a practical session in the psychology class.

The professor showed a large cage with a male rat in it:

The rat was in the middle of the cage.

Then, the professor put a piece of cake on one side and put a female rat on the other side.

The male rat ran towards the cake and ate it.

Then, the professor changed the cake and replaced it with some bread.


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