Fig. 1 Projection of the three regions of high acuity in the visual field of a hawk. The central foveae in the two eyes project to two monocular regions (c), while the temporal foveae in each eye project to a binocular region (t). In the case of this species, a rear portion of the field is out of view (x). (Walls GL: The Vertebrate Eye. New York: Hafner, 1967)