The snakey language of Parseltongue is spoken by the descendents of a school's founder. Name the film series.

We first learn Harry Potter is a wizard due to his ability to speak to snakes. Parseltongue is a language of hissing and spitting that only snakes and Parselmouths, like Hogwarts founder Salazar Slytherin, can understand. Cambridge professor Francis Nolan helped create phrases for the films, which he based upon the Uralic and Bantu languages.

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