Do zebras see in black and white?

http://www.horsetalk.co.nz/2012/11/21/color-vision-horses-do-horses-see-color/#ixzz436y1iY1S

Horses and zebras are related. Horses can definitely see the difference between blue and grey, between yellow and grey and between green and grey. They can tell red from grey to some extent but they find this much more difficult than the other discriminations.