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In page Kuntilanak:

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The Indonesian Kuntilanak is similar to the Pontianak in Malaysia, but commonly takes the form of a bird and sucks the blood of virgins and young women. The bird, which makes a "Ke-ke-ke" sound as it flies, may be sent through black magic to make a woman fall ill;[1] the characteristic symptom being vaginal bleeding. When a man approaches her in her female form, the Kuntilanak suddenly turns and reveals that her back is hollow, much like the Sundel bolong the prostitute ghost with her large gaping hole on her back. A Kuntilanak can be subdued by plunging a sharp nail into the top of her head.[citation needed]