Alastor Moody's spiders



Bartemius Crouch Jr., impersonating Alastor Moody, used three spiders during Harry Potter's fourth year at Hogwarts School of Witchcraft and Wizardry. He used them to show the effects of the Unforgivable Curses. After casting the curse on each spider, he taught the class, consisting of Gryffindor students, a little bit about the spells. The Gryffindors continued to learn about these three spells in their fourth and sixth year.