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
Yellow-collared lovebird lightening of the darker feathers, most noticeable in the wings, and face. It was first noted from Green (Wild) coloured parents, & originally called ""Yellow"". This new colour was soon built up in numbers by passionate aviculturelists, and once secure was bred to Blue coloured birds. The result was then known as ""White"", but we now call this combo a Dilute Blue. Yellow-collared lovebird The yellow-collared lovebird ("Agapornis personatus"), also called masked lovebird or eye ring lovebird, is a monotypic species of bird of the lovebird genus in the parrot family Psittaculidae. They are native to northeast Tanzania and have