Figure 2
From: Anatomical evidence for scent guided foraging in the turkey vulture

Univariate scatterplots of the relative size of the following brain regions in turkey vultures (red) and black vultures (black), expressed as a proportion of total brain volume: (a) optic tectum; (b) nucleus rotundus (nRt); (c) entopallium; and (d) olfactory bulbs (OB). (e) A univariate scatterplot of olfactory bulb volume expressed as a percentage of total telencephalon volume. Significant differences between the two species are indicated by an asterisk.