Views from 'crabworld': the spatial distribution of light in a tropical mudflat.

1989 ) and for this it may be significant that the spectral sensitivity of the main retinular cells R1-R7 covers the wavelength range below 550 nm where sky-ground contrast is highest (Fig. 4 ) and where intensity variations in the sky (blue sky and clouds) and on the ground (specular reflections and shadows) are smallest (Fig. 5 ).

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