Fig. 7. Calculated relative photon catches for each of the single cone types in the retina of the peafowl Pavo cristatus. Visual pigment spectral absorptance was modeled using mathematical templates of the appropriate _max (Govardovskii et al., 2000). The outer segments of all single cones were assumed to be 16 µm long (as for the chicken, Morris and Shorey, 1967) and contain a visual pigment with an end-on specific absorbance of 0.015 µm^-1 (Bowmaker, 1977). The calculated spectral absorptance of each visual pigment was multiplied by the spectral transmittance of the combined ocular media (Eye in Fig. 4), the spectral transmittance (1-absorptance), and cross-sectional area (diameters from Table 1) of the relevant oil droplet, and normalized to the SWS cone.