"May I borrow your pensieve, Professor?" Harry asked.
Dumbledore blinked at that, and then asked, "For what purpose?"
"I want to show Hermione a memory of Nagini." He turned to Hermione. "Trust me, when you see it, you'll say, 'that's a bloody big snake'!" Dumbledore smiled while Hermione rolled her eyes."
cracks up laughing If most of the descriptions of Nagini I've read are true, she's like an over-grown viper of some kind, perhaps a bamboo viper or one of these lethal exotic species. Certainly even a mutated adder's venom wouldn't be any more powerful, assuming it's still the same venom as normal-sized ones...?