. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 400 Comparative Animal Physiology the binocular field is 20-30 degrees horizontally directly ahead, with ex- tremes of 4 to 40 degrees or more. Most birds have binocular fields (Figs. Ill, 112), and these are known to vary from 6-10 degrees in parrots to 60-70 de. Fig. 111. Projections of the four foveas of a hawk through an imaginary surface at the distance of momentary accommodation and convergence, forming a "visual trident" of high resolving power. (Courtesy of Dr. Gordon L. Walls.) I'M Fig. 112. F
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 400 Comparative Animal Physiology the binocular field is 20-30 degrees horizontally directly ahead, with ex- tremes of 4 to 40 degrees or more. Most birds have binocular fields (Figs. Ill, 112), and these are known to vary from 6-10 degrees in parrots to 60-70 de. Fig. 111. Projections of the four foveas of a hawk through an imaginary surface at the distance of momentary accommodation and convergence, forming a "visual trident" of high resolving power. (Courtesy of Dr. Gordon L. Walls.) I'M Fig. 112. Freezing posture of bittern, showing binocular vision beneath head. ;" grees in owls. Some birds even have a binocular field of view helow the bill, , a bittern can assume a "freezing" posture with its bill almost vertical and still have a binocular field \'entral to the raised head, , horizontally (Fig. 112). In simians and in man the binocular field is about 140 degrees, , the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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