- Professor Grubbly-Plank: "Yes, these are Bowtruckles, and as Miss Granger righty says, they generally live in trees whose wood is of wand quality. Anybody know what they eat?"
- Hermione: "Wood lice. But fairy eggs if they can get them."
- — Professor Grubbly-Plank teaches fifth years about bowtruckles.
Wood lice are insects that live in trees. In appearance, they somewhat resemble grains of brown rice. They are a favourite food of Bowtruckles, and are offered to them by wizards and witches who wish to obtain wood from the tree they live in to use in making wands.
- Harry Potter and the Order of the Phoenix (First appearance)