Consider an 11 mile stretch of the Colorado River and divide it into 1 mile segments. Imagine placing a colony of bees in the middle segment of the 11. Number this segment 0, to indicate the middle. Number the segments upstream 1 through 5 and number the segments downstream -1 through -5.

• Flip a coin.
• If the coin lands heads, move one mile upstream.
  If the coin lands tails, move one mile downstream.
• Keep track of the number of coin flips necessary to move 1, 2, 3, 4, and 5 miles away from the starting point.
• If you run this experiment several times or if others run this experiment, you will discover the speed of migration with no new bee colonies.
• Migration may move faster in one direction than another. This can be silulated by placing the appropriate number of black and white beads in a styrofoam cup or by using the TI-82 program WALK.