The favoured prey of the Murtlap are crustaceans, though they will also go for the feet of any human foolish enough to step on them.
The growth on the Murtlap's back may be pickled and eaten to improve one's resistance to jinxes, although eating an excess of pickled murtlap may cause one to grow unsightly purple ear hair. Murtlap Essence is a home remedy for cuts and abrasions. Murtlap tentacles are included in Murtlap Essence which Hermione let Harry dip his hand in to heal the cuts after his detention with Dolores Umbridge.
- Fantastic Beasts and Where to Find Them (Mentioned only)
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Harry Potter and the Order of the Phoenix (video game) (Mentioned only)
- Harry Potter and the Deathly Hallows: Part 1 (video game) (Mentioned only)
- Wonderbook: Book of Potions