Carr blanched when the professor reprimanded her, but nodded and smiled a little nervously. "I'll remember next time, professor. Sorry," she said. At the question, however, she found herself at a loss. Common potion ingredients? How was she supposed to know that?

She cleared her throat, glancing at the ingredients that had been included in her starter potions set. "Well, beetles can be found all over the grounds," she said. [b]"And their various bits are used potions. She looks through the rest of them, thinking furiously. Armadillo bile? No. No armadillos here... Powdered unicorn horn? Didn't that sixth year say something about unicorns in the Forest? Oh, I have no idea. What the devil is a bezoar? Tubeworms. Safe bet.

"With a bit of digging just after a good rain, tubeworms start surfacing when... their little holes fill up with rainwater."