Why is he doing this..

[Bogertophis]

Jeez, he was stressing me out to the point that I had a dream about this last night. Ha, can you tell I haven't even had him for a year yet? I am very easily freaked out

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Don't feel bad...you'll learn to 'read' your snake better, the longer you observe him. I've been at this for many years w/ many snakes, it's just practice.
When it's your first, it's easy to worry & over-think it; the minute I saw your video, I knew. Practice...

And remember, snakes only need a few molecules of scent...never underestimate their sense of smell.