are you referring to discussion on this part of the forum? i'm confused.
if so, it's because elapidae and viperidae are the two families of venomous snakes... rear fanged colubrids are just another colubrid. besides, it's proven that the salival secretions of the duvernoy's gland are the toxic part of the snake and in that case you could literally call a garter snake 'rear fanged venomous'.
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