For each species, the left pane depicts a coronal section of the anterior cerebellum (near the facial colliculum of the rhomboid fossa), and the right pane of the posterior cerebellum (first available section in which white matter is no longer present). The dark overlay indicates the medial cerebellum. Note the absence of lateral cerebellar hemispheres in the barn owl. All illustrations are to scale, except for those of the barn owl. Original illustrations of Macaca mulatta, Ursus maritimus, Zalophus californianus, Bos Taurus, and Tursiops truncatus come from www.brainmuseum.org, Tyto alba comes from brainmaps.org, and Hylobates lar comes from the collection at the Vogt Institute for Brain Research (Zilles et al., 2011).