Who Graffitied Hermione?

Hermione is stunned. A secret admirer has graffitied her likeness on all the walls of the zoo. Who did this? The Tiger? The Bird of Paradise? The Baboon? As for Sherlock, the Ostrich asks for his advice in matters concerning seduction. He claims to be an expert in the matter thanks to his training with Ball of Purity. But is that really true?