Evolution of human colour vision lights, which appear to be clear. Other colour perception issues include having trouble distinguishing yellows from reds and violet, lavender and purple from blue. In other cases, objects that reflect both red and blue light may appear to just be blue to these individuals. Deuteranopes, who are missing medium wavelength sensitive cones, are similar to protanopes in that they cannot distinguish between colours in the green-yellow-red part of the electromagnetic spectrum. However, deuteranopes do not suffer from dimming issues. For example, purple colors are not seen as being opposite to other colours in the spectrum but instead appear to be
Blue-tailed bee-eater Blue-tailed bee-eater The blue-tailed bee-eater ("Merops philippinus") is a near passerine bird in the bee-eater family Meropidae. It breeds in southeastern Asia. It is strongly migratory, seen seasonally in much of peninsular India. This species is sometimes considered to be conspecific with the blue-cheeked bee-eater, "M. persicus". This species, like other bee-eaters, is a richly coloured, slender bird. It is predominantly green; its face has a narrow blue patch with a black eye stripe, and a yellow and brown throat; the tail is blue and the beak is black. It can reach a length of 23–26 cm, including the two