At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
Hermione Granger read about this transfiguration while studying for her Ordinary Wizarding Level examinations in May of 1996 while discussing Professor Hagrid's request that they train his giant brother Grawp how to talk.
From strigis, the genitive form of strix, the Latin word referring to the Screech Owl; from forma, Latin for form or appearance. Also, in biology, Strigiformes is the name of the taxonomic order that includes all owl species.
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