More Reindeer

I asked at work what the difference between caribou and reindeer was. I was told, jokingly, that caribou have two ears and reindeer have one ear. That means if you shoot an animal, and see it has a reindeer tag on it, you lop off the ear and they can't prove it was part of the reindeer herd. Caribou are mostly wild and reindeer are part of a moving herd that they have pretty much domesticated, like the lower 48's equivalent of when "the cows come home."