Excerpt
In the Fibonacci sequence
each new number comes
from adding up the two before
and figuring the sum.
This number set is used to plot
a graceful curving line
that's often found in nature
as part of its design.
Fibonacci creatures
have a certain body part
which fits the winding, coiling shape
that spirals on this chart.
These parts are most important
the help the beasts survice.
Finding food and fighting foes
can keep each one alive.
From the Hardcover edition.