"Well, Mister Potter," McGonagall said, finally finding her words again, "Well done indeed, an excellent display of the vanishing spell, ten points to Gryffindor," Hermione turned back to her own snail, eyes narrowed and full of purpose, "I wonder, if you will find such success with a more complicated animal?" she said hesitantly, conjuring a small field mouse with the flick of her wand, and a cage to contain it with another, "A mouse, as both a mammal and a vertebrate, is more difficult to successfully vanish than a snail, as an invertebrate," the cage and mouse were placed in front of Harry, "Again, if you will?"