Melee Wizards of Hogwarts

Are there magic circuits in the Harry Potter world? The magic circuit in my memory is similar to the magic circuit in Fate/Stay Night 😰

I read a book friend complain about it before, saying that owls are birds of prey and generally only eat meat and insects, so I thought it was just average and didn't pay much attention to it. But when the author wrote that owls like to eat nuts, I searched again on Baidu. It's true that owls don't eat nuts very much.

Is the time wrong? The author wrote about the European Middle Ages