Advanced eyes cannot detect more shades of colour

Birds have one of the most impressive vision systems in the animal world. But despite their advanced retina, birds are not significantly better than humans at determining different shades of similar colours. Few animal groups show such a great variety in colour as the birds’ plumage. Many studies have shown...

Colours in the dark

After the sun has set and darkness falls, our eyes can no longer see in color. The reason for this is that the cells responsible for color vision, the cones, need a certain amount of light to function. In our eyes, and in the eyes of other vertebrates, there are...