erential equations that model the behavior of
      a pair of predator and prey populations.
    </p>

    <p>
      The physical system under consideration is a pair of animal populations.
    </p>

    <p>
      The PREY reproduce rapidly; for each animal alive at the beginning of the
      year, two more will be born by the end of the year.  The prey do not have
      a natural death rate; instead, they only die by being eaten by the predator.
      Every prey animal has 1 chance in 1000 of being eaten i