How far south in South America (Argentina) do chaco tortoises (Chelonoidis chilensis) go. How cold-tolerant are they, and are they good burrowers? People don't really brumate (hibernate) them in captivity, but how often do they do so in the wild? I don't keep this species, but since they are from the southern temperate zone, I'm just wondering how they compare to the Gopherus and Testudo species in terms of the climate they live in, and their adaptations to it.