Results
We found that in all instances visual contrast between adjacent UV+ and UV- color patches was high, with JND values well above the conservative discrimination threshold (JND = 3, Table 1). However, when comparing between UV-sensitive and VIS-sensitive models, we found that although achromatic contrast was nearly identical between the two models, there were differences in chromatic contrast (Table 1). For all comparisons chromatic contrast was higher in the UV-sensitive model, although the magnitude of the effect varied by taxa. Moreover, when considering each species/subspecies individually we found that the magnitude of the difference between UV and VIS models was very high for butterflies but comparatively low for frogs in both relative and absolute terms (Figure 1, Table 1).