Painting of a hippopotamus

An Hippopotamus was immortalised on a portrait hung at Hogwarts Castle. By 1993, this portrait was hung in one of the topmost staircases of the Grand Staircase.

History
On the 31st of October 1993, Sirius Black attacked Fat Lady's portrait on a vain attempt to gain entrance on Gryffindor Tower. Scared, the Fat Lady ran away hiding on other portraits, including this one, where she hid behind the hippopotamus.

Appearences

 * Harry Potter and the Prisoner of Azkaban (film)