He will move to the warmer side if he's cold, but he still might be dark. However, boas change color for a lot of reasons - it'd be tough to tell if yours is cold, or stressed out, or going into shed. It's not abnormal for boas to get darker or lighter, though.
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Lauren Madar
www.ophidiagems.com
1.1 Hog Island Boas
1.1 Hypo BCI
0.1 Sorong-type GTP
1.0 Normal Ball Python

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• color change - juan m, Mon Oct 9 15:32:30 2006
• RE: color change - liquidleaf, Mon Oct 9 15:39:54 2006
• RE: color change - juan m, Mon Oct 9 16:02:23 2006
• RE: color change - liquidleaf, Wed Oct 11 20:19:01 2006