Ferret to human spell

"Are you a wizard or not?"

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"'No!' cried Professor McGonagall, running down the stairs and pulling out her wand; a moment later, with a loud snapping noise, Draco Malfoy had reappeared, lying in a heap on the floor with his sleek blond hair all over his now brilliantly pink face."

—McGongagall untransfigures Malfoy^[src]

This spell (incantation unknown) is used to transform a ferret into a human, and serves as the reversal for the human to ferret spell. It was used by Minerva McGonagall on Draco Malfoy in 1994.^[1]