NOTE: This is copied directly from my post below about hide spots. Read on...
From my own personal experience...
When I first got my boa, and was right in the middle of the very steep learning curve that accompanies a new kind of pet, I noticed that my snake spent most of its time "hiding" inside the water bowl with 90% of its body being submerged. First, I checked for mites and found none. Then I thought it was too hot inside the cage, so I added more substrate, raised the light several inches, got a temp gun, etc. Turns out the temps weren't more than a few degrees off of ideal, and my snake still "hid" in its water bowl even after a slight temp adjustment.
After some research on the web, I finally decided to try a different and more functional hide spot since I had never seen my snake use the silly "half log" that I had bought. I took the tip from PE and began using the clay base of a plant pot with an entry way cut out, and IMMEDIATELY my boa was out of its water bowl and now spends a lot of time curled up under there.
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David - Houston, TX
Young Red Tail Boa
Purchased 11/16/03
www.geocities.com/davidag02