The oculomotor range of marmosets is more limited than macaques. A, Density of fixation positions in viewing natural images shown in color scale for a marmoset. White rectangle indicates the area of the viewed image. B, Density of fixation positions over the same set of images for a macaque. C, Density of fixation positions as a function of radial distance from the center of mass for two marmosets and macaques.