The Arctic tundra is by far one of the most harsh climates on earth.
Despite the cold many plants and animals thrive here. Despite what you think, Antarctica is a desert. The rainfall here averages out to 50 Millimeters per year.
Cold is a nice way to put it, temperatures here can go forty below zero regularly.
Here the only way to survive, is if you have evolution on your side. Almost all animals here are specially adapted to the climate and surroundings down the last Hare. Get it? like a rabbit? Never mind, anyways since it's such a remote Environment there's only a few