Hermione assumed Brewmastery would be Potions, but it turned out to also include a lot of what had at Hogwarts been Herbology. This was the class during which the students explored the extensive grounds, making use of their warm fur cloaks and occasionally having absurd cold-resistance contests. On these trips outside their Professor, an excitable sparrow-Animagus, was always fluttering about talking about all the different plants, how to care for them, and what sort of potions they could be used for, flickering between witch and bird like a faulty light-bulb. (Hermione took care not to use this analogy out loud, since she suspected it would mark her for Muggle-raised.)