Who Made the Crocodile Cry?

Crocodile is in despair. A criminal has broken the precious piggy bank which his father gave him and turned him into a banker. The only thing we know about the culprit is that he can hit hard and precisely with a blunt object. Who could have done it: Kangaroo, Porcupine or Mr. Hippo? In the meantime, Sherlock and Hermione are annoyed by mosquitoes and are covered with bites.