At least some content in this article is derived from information featured in Fantastic Beasts: Cases from the Wizarding World. Spoilers will be present within the article.
- Mathilda Grimblehawk: "Winifred Whittle? Sorry to intrude, but we're from the Ministry of Magic. We need to ask you a few questions."
- Winifred Whittle: "Finally, a response to my letters about the scandalous fairy habitat intrusion!"
- — Mathilda Grimblehawk and her partner first approach Whittle to enquire about the attacks on Muggle construction workers[src]
Winifred Whittle was a witch who established the Witches' Holistic Institute for Friends of Fairies (or, simply, WHIFF) of which only she and Sage Bragnam were members. She was openly critical of Muggles, denouncing them for cutting down the forest where fairies lived. She lived in a cottage in a forest inhabited by magical creatures.
Bethany Harrison, the daughter of the foreman of the Muggle construction works, was scared of her, and included her in a drawing of the forest in which she was depicted as a green-tinged hag with big teeth. While at first, Mathilda Grimblehawk suspected it might be Whittle that was attacking the Muggle construction workers in an attempt to scare them away from the forest, after meeting her, she dismissed it, regarding her "a harmless fairy fanatic".