Slow Metabolisms. Cryoceroses survive on stunted grasses and other plants that thrive in the tundra, as well as ice and snow, to replenish their icy exteriors. Despite their size, they don't require a great deal of sustenance, and they conserve their energy by slowly grazing across frozen plains. Their ponderous movement fools the unwary into believing that distance equals safety. Indeed, cryoceroses endure much provocation before they decide to act, but they run at and spear or crush those who irritate them. Once their ire is up, they rarely give up pursuing the source of their anger; only by leaving their vast territories can one hope to escape them.