Reindeer could not have teased Rudolph over red nose, researchers say

Rudolph the red-nosed reindeer was unlikely to have been laughed at and called names due to his appearance - because he and his fellow reindeer are partially colourblind.

Researchers have found that reindeer cannot detect the colour red. Source: Press Association

Rudolph the reindeer may have had a red nose but he and the other reindeer wouldn't know it, researchers have concluded.

In news that may shock the North Pole, University of Exeter scientists have revealed that Santa's sleigh-pullers lack the colour-detecting eye cells that humans use to detect red.

The same applies to orange - meaning Donner, Blitzen and the rest might struggle to spot any carrots left out for them at Christmas.

"Reindeer can't see red light or tell the difference between red, orange and green," explained Professor Martin Stevens, of the University of Exeter.

"So they wouldn't be able to see the red of Rudolph's nose or the orange of carrots.

"However, they do have ultraviolet vision, and use this to see lichen hidden in the snow in the Arctic, and potentially even spot white wolves or other predators because fur absorbs UV light whereas snow reflects UV light.

"So a camouflaged white wolf to us would stand out to reindeer."

Apart from the UV vision, reindeer eyesight is a little like that of dogs, which are also unable to tell the difference between red, orange and green.

Prof Stevens and his colleagues' work on animal vision also includes horses, leading to a trial of new colours on fences at racecourses.