I was watching "Crocodile Hunter" the other night, and Steve was showing rattlesnakes somewhere on a hill or mountain that was 6000 ft above sea level. He stated that the snakes were so dark in color because when they needed to they could warm up faster 'cause dark color absorbs heat faster. This makes sense and got me thinking - I always hear about boas getting darker as they age. Could this be slowed or prevented with more attention year round to temps? I have seen pictures of very large, light colored boas, and usually there is a palm tree in the background or something that would indicate a southern climate that would make it easier for the owner to provide warm temps. Anybody else have a thought on this subject?