Investigated the existence of color vision in 2 Game Bantam cocks of impure breed. The ability of the fowl to react to different wave-lengths; and the appearance of relatively abrupt changes in the stimulating value of different parts of the spectrum, were observed. Differential reaction to stimuli was obtained by the Yerkes discrimination method. The Yerkes-Watson light apparatus provided visual stimuli. The tests were employed in the study of red-green discrimination. All the tests were carried out in a completely darkened room with the experiment box enclosed in a black hood. Results show that the fowl was sensitive to differences of wavelength irrespective of intensity. The spectrum of the fowl was divided into areas of widely different reaction value, of which there were not less than 5. There was also some evidence for a Purkinje effect. (PsycINFO Database Record (c) 2006 APA, all rights reserved)