I have actually seen this on a regular basis. There is an Eastern and a Western hognose that are housed beside each other at the museum I used to work at. They are routinely perched out in front of their boxes so they can get clear views of the room. This is contrary to all of the other snakes that are usually completely hidden. The Western hognose, in fact, seems to favor one side as if he has a good eye he prefers to see out of! I am glad you posted this, because I was beginning to wonder if it was purely an environmental phenomenon. I would imagine that since the snakes are diurnal and have (relatively) good vision, they may enjoy the visual stimulation more than other snakes.
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Virginia Herping
http://groups.yahoo.com/group/VaHS
Virginia Herpetological Society
http://fwie.fw.vt.edu/VHS
"The irrational fear of snakes is the only excuse a grown man has... to act like a complete sissy" - Colchicine
... nature has ceased to be what it always had been - what people needed protection from. Now nature - tamed, endangered, mortal - needs to be protected from people. When we are afraid, we shoot. But when we are nostalgic, we take pictures.
Susan Sontag