Not entirely true. A cottonmouth will coil up and open up it's mouth as a warning to potential threats. That's the only one I know of for sure that will show their fangs

If you watch closely, however, you will see that a cottonmouth generally keeps its fangs folded carefully against the roof of its mouth and out of the way when doing it's open mouth display.




If their intent was to show you their fangs, I think they would actually bring them forward.

I was bitten by a rattlesnake (C. triseriatus) and I can assure you, I never saw his fangs at any time!
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Chris Harrison
San Antonio, Texas

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