Q: Are horses colour-blind?
A: It’s a common misconception that horses are entirely colour-blind. Horses perceive colour differently than humans with normal colour vision, but they are not colour-blind. Horse colour perception is quite similar to that of a colour-blind human (which is where some of the confusion comes in). However, this does not mean that a horse sees in grey scale, but he just perceives colour differently. A horse sees only two or three visible wavelengths in the colour spectrum. He sees blues and greens, but not reds, so that a red apple or orange carrot appears as shades of green or brown to the horse.