Making a dramatic silhouette a gaunaco and her cria rest in Torres del Paine National Park in Chile. Guanacos survive in both mountain and plains habitats. Their hemoglobin has a much higher affinity for oxygen than that of other mammals, allowing them to function at high altitudes (up to 4,800 meters). The guanaco cria weighs 8 to 15 kilograms at birth and can run almost immediately.