Cross-Species Switches are a type of Transfiguration that is caused when Transforming spells are modified in certain ways[1]. They are presumably a type of Switching Spell that changes certain aspects of different species and may therefore be Trans-Species Transformation.


The fourth year transfiguration students at Hogwarts School of Witchcraft and Wizardry were given homework on Cross-Species Switches, as listed below:

  1. Describe, with examples, the ways in which Transforming Spells must be adapted when performing Cross-Species Switches[1].
  2. If bodyweight is A, viciousness is V, intended transformation is T, wand power is W and concentration is C, and assuming T=(WxC)/(VxA)xZ then what does Z equal?[2]


It's easier to preform Cross-Species Switches when the creatures are similar in appearance or structure.


Notes and references

  1. 1.0 1.1 Harry Potter and the Goblet of Fire, Chapter 22 (The Unexpected Task)
  2. Harry Potter and the Philosopher's Stone (film) - Scene 14 (Potions and Parcels)