Harima Kenji's pet giraffe, Pyotr's name is pronounced as poy-to-ruu. In Chapter 154 of the manga, Eri is shown hugging a stuffed toy version of Pyotr. Eri also apparently has an encounter with Pyotr in the School Rumble PSP game. Pyotr is also featured as an image on Harima's cellphone call display. (Source: AniDB)