4. Seed-traps
Seed-traps were circular, 1 meter in
diameter, and built from 1.7-mm mesh, plastic
netting secured to a wire frame. Four or more, 0.3
m high bamboo legs support each trap. The main
pole of the perch was fitted vertically through a
small hole cut in the center of the trap and the
netting was then sewn tightly to the shaft so that
no seeds pass through (Fig. 2). Traps of the same
design were placed at points without perches.