Boar

The Boar, or Wild Boar, is a mammal native to much of Eurasia, North Africa and the Greater Sunda Islands. It is also a known corporeal form of the Patronus Charm.

History
On 2 May 1998, Hufflepuff student Ernest Macmillan conjured a fully corporeal Patronus during the Battle of Hogwarts to defend Hogwarts Castle and its inhabitants against Dementors which were attacking the school on the orders of Lord Voldemort.