Food-quality preferences during visual and olfactory trials.

<p>Food choices of three strepsirrhine species are depicted (for individuals that showed relatively strong food preferences during baseline trials) when (A) only visual or (B) only olfactory cues were available. Presented are the frequencies (mean ± standard error of mean) with which the animals selected red foods (i.e., young leaves or ripe fruits; shaded bars) versus green foods (i.e., mature leaves or unripe fruit; open bars) when only one sensory cue was available. Numbers at the bottom of the open bars represent the number of individuals used in the analysis (G-test: * <i>P</i><0.05, *** <i>P</i><0.001).