METHODS
I divide the class into groups of 5-6 students per
group. In each group, one student serves as the timer,
and data recorder for the group (students can
alternate jobs for Activity 2). The remaining students
are “birds” and forage for seeds. Students use
tweezers, pliers and other household items to
simulate variation in bird beaks within a population
of birds feeding on a variety of types of seeds. The
“birds” each select one of five different beaks, such
that in each group there are five different types of
birds. I provide a range of beaks sizes to choose
from. Ideas for beaks include: pointed tweezers, wide
tweezers, eyelash curlers, needle nose pliers, regular
pliers, forceps, snap clothespins, and different sizes
of binder clips. When choosing beak types, choose a
range of types including some that are very pointed,
and others that are wider. This activity works best if
all the pliers are spring loaded.