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Fig. 4. Normalized radiance spectra for three body regions (head, wing and leg) of
chick robots presented under five different types of filters (control, neutral
density filter; UV, UV blocking; SW, short-wave blocking; MW, medium-wave
blocking; LW, long-wave blocking). Nchicks=10;
Nmeasurements=12 per filter and body region,
taken under three different light conditions. Bold line is the median, grey
lines represent 1st and 3rd quartiles. Spectra were calculated by first
obtaining an individual median from four randomly located measurements within
each body region and then calculating a median value for the group.