Welcome to Harry Potter Theory. Today, we'll be discussing why Fred and George Weasley never noticed Peter Pettigrew - aka Scabbers the rat - on the magically revealing Marauder's Map.

I suppose to start with, we can address the question of: Why would they? Well, as we learn near the end of Harry Potter's third year at Hogwarts School of Witchcraft and Wizardry, the Marauder's Map has the capability to reveal each and every person roaming the hallowed halls of the school, regardless of their form. It represents witches and wizards with a dot that has a corresponding name - which is ALWAYS their true identity, again regardless of any magic that may make them appear differently when confronted in person. And it is through the Map that Harry discovers a number of unsettling secrets that have to do with the night his parents were murdered - including the fact that Peter Pettigrew, his father's mate who supposedly died that same night, is ALIVE. How does he discover this? He sees him on the Marauder's Map. But I'm getting ahead of myself...

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