FIGURE 14-11 Inferring Spatial Memory This graph relates hippocampal volume to forebrain volume in food-storing (left) and non-food-storing (right) families of songbirds. Birds that cache food, such as the black-capped chickadee, have hippocampi about twice as large as those of birds, such as the sparrow, that are not cachers.

Data from D. F. Sherry, L. F. Jacobs, & S. J. C. Gaulin (1992). Spatial memory and adaptive specialization of the hippocampus. Trends in Neuroscience, 15, pp. 298–303.