Figure 1
From: Long- term effects of previous experience determine nutrient discrimination abilities in birds
Reflectance spectra of artificial foods. Numbers in the panel identify the number of the experiments. The dotted line indicates the reflectance of orange foods, the solid line that of red cubes. Note the minor difference between reflectance spectra used in experiments 5 and 7. Overall reflectance is low as agar cubes partly transmitted the light that illuminates their surface.