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The Caterwauling Charm (incantation unknown) causes anyone entering the perimeter of a certain area to to set off an "alarm" which makes a high-pitched shriek. Harry Potter, Hermione Granger, and Ron Weasley accidentally set off a Caterwauling Charm when they Apparated into Hogsmeade on 1 May, 1998. This alerted the Death Eaters in the village to their presence, although the trio managed to avoid being captured with the help of Aberforth Dumbledore.

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