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Sled dog teams. Husky dogs (Canis familiaris) harnessed together in teams. These domestic dogs are used to pull sleds over the Arctic snow. Behind the dogs are the houses of Ittoqqortoormiit, or Scoresbysund, a settlement populated by Inuit Eskimos. Ittoqqortoormiit is in Greenland, at 70 degrees north. (KEYSTONE/SCIENCE PHOTO LIBRARY/SIMON FRASER)