I've always heard King Cobras show the most intelligence (although unclear how what kind of measurement is involved in making that determination).
Of the species I keep, retics are the smartest. You can almost see their little gears turning when they are looking at things.
The dumbest of what I keep are the ATBs. Just instinct, something moves? bite it and figure it out later! I've had them almost kill themselves from their own stupidity.
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