Animals with dichromatic vision have two receptor types (light-sensitive cells in the retina of the eye) used in colour vision. This gives them limited colour vision, with the ability to see only one or two colours (such as blue and yellow). However, they can be better at differentiating between different degrees of luminance (how light or dark an object is), and at detecting hidden objects.

So far, the dichromats we have caught eating our eggs are mongooses and genets.