The walrus

The walrus is a neutral mob that inhabits the Frozen Ocean and possesses long tusks. Walruses can move across the ice without slipping, but they are more adept at swimming than moving on land (they use the land for resting). Walruses will turn hostile if attacked by the player or their natural predator, the polar bear; however, if left alone, they remain passive—and may even approach the player out of curiosity. However, it drops nothing when defeated.