The fish downstream said they could not swim as easily because of the dam. Other animals wanted to use some of the water for irrigation purposes. The discussion went on and on, but eventually some progress was made and compromises were made to everybody's satisfaction.
During this discussion, however, a small argument developed between a Grizzly Bear and a Turtle. The Grizzly was bragging about how fast he could run. The Turtle was boasting about how fast he could swim. Then they said they could outdo each other and eventually challenged each other to a race.
Now, you can imagine that this is similar to the fable about the tortoise and the hare, and it is, but with a twist. They had a bit of a problem in deciding about how to do the race, because it was beginning to be wintertime and the river had frozen over. How could you tell how fast the turtle was going underneath the ice?