In Siberia, which makes up a large part of Russia's territory, temperature differences between summer and winter can be very great. In the village of Oymyakon, temperatures often drop below -50 degrees in winter while sometimes exceeding 30 degrees in summer. Northern Siberia mostly consists of permafrost tundra where trees hardly grow. It is home to animals such as Siberian wolves, reindeers, and Steller's sea eagles. Reindeers have been kept as domestic animals for a long time and are also valued for pulling sleds.