... of Biologists Limited 2001 2001 colour vision colour space illumination Old-World primate. The eyes of many vertebrates contain ocular filters that absorb ultraviolet radiation (300–400nm) ( Fig.1 ). For example, in primates protein pigmentation in the lens of the eye prevents radiations...

... unique is in the colour constancy of bees. Theoretical models predict that bees will perform poorly at identifying pure ultraviolet signals under conditions of changing illumination, which may explain the near absence of pure ultraviolet-reflecting flowers in nature. *Author for correspondence (e...