Oblique color vision in an open-habitat bird: spectral sensitivity, photoreceptor distribution and behavioral implications.
Moore, B. A., P. Baumhardt, M. Doppler, J. Randolet, B. F. Blackwell, T. L. DeVault, E. R. Loew, and E. FernåÊndez-Juricic. 2012. Oblique color vision in an open-habitat bird: spectral sensitivity, photoreceptor distribution and behavioral implications. Journal of Experimental Biology 215:3442-3452.