The brush devil is an animal found on Qo'noS. It is known for having an extremely loud hunting scream.
Sometime between 2366 and 2372, Worf joined his brother Kurn in hunting the animal. Kurn would scare the animal and drive it towards Worf. Worf's participation in the hunt of the brush devil would become one of the most satisfying experiences of his life. (DS9 novel: The Heart of the Warrior)