The chief enemies of the guanaco are the Patagonian Indians and the puma, as it forms the principal food of both.
The water-courses and depressions of the shingly steppes afford pasturage sufficient for the guanaco, and in places support a thorny vegetation of low growth and starved appearance.
Of the indigenous fauna, the tapir of the north and the guanaco of the west and south are the largest of the animals.
The guanaco (Auchenia), which ranges from Tierra del Fuego to the Bolivian highlands, finds comparative safety in these uninhabitable solitudes, and is still numerous.
On the arid plateaus of the north-west, the guanaco and vicuna are still to be found, though less frequently, together with a smaller species of viscacha (Lagidium cuvieri).