|"Are you a wizard or not?"
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- "The guinea-fowl they had been changing into guinea-pigs had been shut away in a large cage on Professor McGonagall's desk (Neville's still had feathers)..."
- —After a class on this spell.[src]
Guinea fowl to guinea pig is a Transforming spell that is covered in fourth year Transfiguration classes at Hogwarts School of Witchcraft and Wizardry. It is noted that Neville Longbottom was not particularly skilled with these spells.
- Harry Potter and the Goblet of Fire (First appearance)