How do you know when goldfish are hungry? Once a man trained his goldfish to tell him when it was hugnry. He began by not feeding it for several days. Then he tied food to one of a rope and a bell to the other end. He dropped the food into the water. When the fish nibbled on the food, the bell outside the bowl rang loudly. He did this for several days. Then the string without food was put in the bowl. The fish bit at the end of the string just like it did with the food. When the bell rang, the man knew the fish was hungry and threw food into the bowl. After several days the fish learned to ring the bell whenever it was hungry.
Source: Star Reading 3
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