Abstract
In our college, some subjects teach it by the theme of enviornment at the same time,
which we say "Interdisciplinary Colaborative Education". In the class of mathematics, we analyzed
the change in the number of individuals of the Japanese crane by the difference equation, and we confirmed
that the change applied to the logistic curve. Moreover, we illustrated that the logistic curve
appeared in the various scenes, and we developed it into chaos phenomena. A lot of students were
surprised that mathematics was effective for such a natural world, in the following questionnaires.
In this paper, we shall consider the mathematics knowledge needed in this teaching material, and
the meaning of taking up such real data in the class.
