Did you ever play a game called "telephone" when you were a kid? Generally, every one sits in a circle, one person whispers something to the person next to them, it's passed around the circle and you see how much a simple sentence changes by the time it gets back to you...

I think some of this started with someone who read somewhere that cobra fangs have a grove in the front (it's closed though), read somewhere else that some snakes have "grooved teeth" rather than fangs which makes for an inefficient delivery system and got them mixed up in the retelling.

Someone else heard/read this and put it together with reading that rear-fanged snakes have grooved teeth, and before you know it cobras have to chew on you and coral snakes are rear-fanged and can hardly envenomate a human...

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