However, I think there may be some difference causes. For one, I think that being moved into an area with much more stimuli affects the tortoise, but I also think that in general most don't keep them at adequate temperatures indoors. If you go outside on a sunny day with a temperature gun and measure surface temperatures of dirt patches where torts like to bask (or better, measure the temps of the torts shell) I think we might be suprised.
Some info I just put up on a different forum (because I figured I would get flamed here) is that I think for the most part we have been keeping our tortoises too cold. In the cattle trough I keep my female russians in I gave them three basking sites, and they always choose the same one. I measured the surface temperatures of the dirt with my temp gun and found some temperatures as high as 170f! (mostly the average was around 130-140ish). I think we underestimate how the ground heats up outside in the sun, even in mild climates. This is actually the spot where my gravid female chose to lay her eggs as well. I've also noticed that they don't sit under the bulb constantly. They bask for a few minutes to aquire some energy (in simple terms), then they expend it foraging and come back to recharge their batteries. They are offered two other basking spots, one that temped out to be around 100f, and another that is around 90. Before you say that they are attracted by the higher light of the hot bulb, let me say that it is the darkest bulb of all three. It is a red bulb, and it's only 60 watts.
Just some interesting observations about heat and torts. I'm curious as to what kind of temperatures we might be able to get by pointing a temp gun at the shell of an aldabra that's been basking.
Get a tempgun if you get a chance. They are such great tools, but I didn't even use it to set the temperatures. I gave the torts choices, and they found their own temperatures. I'm really interested to see what kind of temperatures I can get in the outdoor pen when summer rolls around next year. If I get the courage, I might let the torts stay out there for a portion of the summer. I'm just worried about people in my neighborhood (we have a crackhead neighbor and there are some bad kids the lurk around at night).
AlWAYS make observations.