Duck, Duck, Goose

This spell transforms two creatures that you can see within range into a duck. Any unwilling creatures must make a Wisdom saving throw to avoid the effect. The spell has no effect on a shapechanger or a creature with 0 hit points. When the targets are transformed into ducks, they are immediately transformed into geese, and then their places are exchanged with the two nearest gees on the same plane of existence. As with the effect of the Geese spell. 

The transformation lasts for 30 days or until dispelled.