Boar

The boars of the Old World are exceptionally ill-tempered and vicious beasts, two traits that the Orcs admire greatly, which is probably why so many have been taken as mounts for the Greenskin hordes. The impact that a charging boar can produce is considerable. Left to their own devices, boars generally root the ground for grubs and menace any creatures foolish enough to interrupt their feeding. Many boars have become entirely carnivorous as a result of the Orcs breeding the trait into their mounts, and then releasing them to mate with other wild boars.

Source

 * : Warhammer Fantasy RPG 2nd ED -- Old World Bestiary
 * : pg. 119

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