Canary transfiguration hex

&nbsp A tempoary hex to change someone into a giant canary. After a few moments, the Transfigured person molts back into themselves.
 * Fred &amp; George placed this hex on seemingly innocent custard creams so that whomever ate one was changed tempoarily into a huge canary. Neville ate one of these Canary Creams, much to the amusement to everyone in the Gryffindor common room.