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Fig. 1. The experimental equipment consisted of a cage constructed from Perspex
with flexible plastic bristles at the bottom, a feeder with sucrose solution
and two perches. The main perch was suspended from an electronic balance,
interfaced to a computer. The vertical feeding perch had pins inserted to
discourage prolonged resting. An infrared photo-detection system, interfaced
to the same computer, was mounted on either side of the feeder in order to
record feeding events. One-way mirrors on two sides of the cage allowed
observation of the bird with minimal disturbance.
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