Spore 2 - Walrus Evolution! "Viking commentary"
Nature
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Despite popular belief, Walrus Overlords are a very fierce race. Their sharp tusks and nipple horns aid them in combat and their ass muscles let them run at the speed of sound.

A family of Walrus Overlords
Walrus Overlords are the only known marine mammals to lay eggs. Unlike their predecessors, the Walrus Overlords posses a semi-metallic overlay which boosts their natural defense and gives them a shiny finish in all the right places.
A newly hatched Walrus Overlord begins life by performing a traditional ass wiggle. Every Walrus Overlord grows armpit hair at birth, even those of female gender.
They grow to full size in under 4 minutes and travel in packs to fight the wildlife. A Walrus Overlord eats about 1000lbs of ass every day. On rare occasions they have been witnessed eating their prey with their own asses.