To this oneness of all native Americans there is, perhaps, a single exception. Some writers look upon the Eskimo as a remnant of an ancient European race, known as the "Cave-men" because their remains are found in caves in Western Europe, always associated with the bones of arctic animals, such as the reindeer, the arctic fox, and the musk-sheep. From this fact it seems that these primitive men found their only congenial habitation amid ice and snow.