The walrus are part of the zones storyline. They spawn on one of the ice flats near ToFS. There are 4 gnolls running around there clubbing them to death. When Lodizal spawns he used to eat the walrus and the gnolls on his way up the hill. They nerf'd this now because people would kite Lodi thru the gnoll camps for free damage.
Anyway, Lodi's shell is quested into the Lodizal Shell Shield by the othmir in CS who hate the gnolls cuz they kill the furry little animals.
Strange story
/shrug