Ice Bears are a race of bears that are typically found in frozen environments. Although they share their white fur with polar bears, they differ from polar bears in that they are significantly larger, with some as big as army tanks, and much more hostile towards humans. Ice bears also travel in packs and are led by an alpha, who is distinguished by his greater size and the purple, leaf-shaped crest on his chest.
Tank is only prominent ice bear in the entire series and he is the shadow of an alpha ice bear that was killed by Igris.