Commutas coniculus
Complex transfiguration that transforms a living thing into a rabbit. It’s hopping good fun!
Please note that the wand work required for this particular transfiguration is rather intricate (see Gilderoy Lockhart’s Lexicon of Charms, Hexes and Magical Must-Haves Extended Edition - found in any good magical book stores near you for as little as three galleons and thirteen sickles - for said wand work) and should only be attempted by N.E.W.T level wizards and witches, as mistakes may cause partial transfiguration, the spell to backfire or just cause the victim to relentlessly hunger for carrots and lettuce.
Do proceed with caution, as the transfiguration remains permanent without the precise counter spell (found only in Gilderoy Lockhart’s Lexicon of Charms, Hexes and Magical Must-Haves Extended Edition).