"An animagus?" She looked more curious than surprised. He did say 'secretly.' "Have you tried it before? What animal have you, or would you, like to be?" She wasn't sure if she could easily place him as any animal.
She squinted her eyes, trying to think just what he reminded her of. He was tall and thin, and though his hair was a dark red, something managed to stand out in her mind. "...An otter?"