Rudolph the Red-nosed Reindeer may be a work of fiction ... Their diet mainly consists of lichen, a plant-like organism that grows on trees and rocks. They also eat moss, grass, and fungus ...

Scientists think this is the reason why reindeer are able to see clearly in the dark and spot their favourite food lichen which is crucial for their survival in winter. Reindeer are known to feed ...

Some reindeer have travelled as far as 100km to the south, in search of ice-free lichen they can access under the snow. Herders are having to track them through the forests of northern Finland and ...