Ariella's hand shot up into the air. She had already done lots of reading about gillyweed, and having studied it in Herbology helped. "Gillyweed - when consumed by a person - causes the witch or wizard to grow webbing between the fingers and toes. Also, they grow gills. It lasts for about an hour."

Once she finished her answer, she grabbed her wand again. "Reparo!" she said firmly, pointing to the split chocolate frog box. It immediately returned to its original state.