This is something I've been thinking about for a long time. Over time, the tectonic plates of the world shift, and it's not just the main continental plates, you have all those small plate boundaries. So the plate boundaries are either constructive, destructive or conservative, and as we all know over millions of years the plates move by massive amounts. In 200-250 million years it is believed the plates will join up to form a super continent again, and Britain will be pretty close to where Antarctica is now. So how does this effect our shelled friends? When the more modern day versions of these creatures evolved, the Earth would've been a very different place, and they would've adapted to certain climates and diets-for instance, the dry Australian outback would've been a mild, tropical forest. Now, surely this means basically the animals are not living in the conditions they receive now. Perhaps, this is why it is hard to keep some species in a way we would consider natural in captivity. And in the wild now, we see a lot of tortoises pyramid. Take Indian Stars as an example, I have seen them pyramid a lot naturally in the wild, perhaps because it wasn't that long ago that it was near Madagascar, but the plate travelled at double the speed of most of the plates in the world, crashing into Asia with the environment changing very quickly. Now of course some of the habitat destruction will not help, but I would be interested if somebody kept them in the way that place would've been when the species was first formed. I am very interested to hear other peoples' opinions on this.