Reindeer and caribou are the same species (Rangifer tarandus). In North America, they are called caribou if they are wild and reindeer if they are domesticated. In Europe, they are called reindeer.

It may sound unbelievable, but reindeer eyes change from a blazing gold in the summer to a deep, dark blue in the winter. However, this isn’t the kind of color change you might expect, as it usually ...