Canary Creams are a joke product created by Fred and George Weasley. Although they look like ordinary custard creams, the biscuits cause the victim to turn into a large canary. The transformation only lasts a minute; once the victim's feathers have moulted, they reappear looking entirely normal.

From the Story

Harry Potter and the Goblet of Fire

Discovered in chapter 21, The House-Elf Liberation Front

Neville eats a Canary Cream by accident during the celebrations in Gryffindor Tower after the first task. Fred and George are selling the Canary Creams for seven Sickles each.

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