Thinking of that extra sense organ they have. Googling now.
Is that it? He does seem particularly interested in mouths & noses. He'll reach out to them & touch his own nose to them.https://twitter.com/christianjbdev/status/810619782051594244 …
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Doesn't say anything about CO2, but possible. http://www.reptileexpert.co.uk/sense-organs-snakes.html …pic.twitter.com/j9XEPS0Gr5
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