Snowwhiskers are a cold-adapted form of the Wind Hopper. Compact but lean, they are pure white in color, though often appear to have swirling patterns of silvery bioluminescence reflecting the aurora above. A Snowwhisker in danger will stifle this bioluminescence to appear camouflaged; but when relaxed, their displays to one another across the mountain peaks can look like the distant glittering of stars. Their ears are somewhat short, their fur quite thick to insulate against the cold, and very often, moisture leaves tiny icicles dangling from their whiskers. Their harsh existence in the cold of Ursa leaves them opportunistic, and all will unflinchingly consume meat if it is provided--but they do not hunt or kill on their own. Snowwhiskers are sometimes solitary, but will also form warrens beneath crusts of snow where they cluster together for warmth.

Mountain Deer are a much bigger relative of Woolly Deer spectacularly well-adapted to the bitter cold of Ursa. They bear thick, white wool--not long, but coarse--and feature small ears, small pale eyes with excellent night-vision, and powerfully gripping cloven hooves for climbing. They're the second-largest of the cave's deer, weighing about three to four hundred pounds, and found only solitary or in small herds among the steepest crags of this cave. With their surefooted nature and resistance to wind and cold, along with spectacular camouflage in the dim light, they can be a real challenge to hunt; spooking them is likely to see them flee out of sight along the ridges in seconds. They can subsist on frozen lichen, often digging out grasses near the lake or nibbling on dead branches and still finding sustenence. Their antlers are short, sharp and dark, forward-pointing, and if cornered they can deliver a nasty stab, headbutt or kick.

Ghostbirds are mysterious creatures found only in the highest parts of Ursa. While only three to four feet tall, weighing about thirty pounds, these birds have a massive wingspan of twelve feet, and use it to soar nonstop through the fog and snow at the top of the mountain cave. They rarely land, even to roost, and are generally difficult for all but the keenest eyes (or highest flyers) to spot. White or light gray in color, they blend in perfectly with the snow and mist. In build they're heavy-bodied but broad- and long-winged, with a long, slender, back-curved neck like a crane's and a slim, gently-hooked, long gray beak. Dark lines on some stretch back to encompass the eyes, which are a silver that often shine with reflections of the aurora-like light. Ghostbirds land only to reproduce, and then only on the highest portions of the mountains, sometimes in shallow caves; the rest of the time they feed by sweeping low and snagging prey or foliage that they deem possibly edible. This is often the only point at which they're spotted by ground-dwellers, giving them their name: they are like ghosts passing only briefly through the world below.

Icebeasts are cold-adapted to an extreme. Based on a reptilian design, they look almost like a komodo dragon in basic form: long-bodied and squat, with a downward-hanging, massive head and long tail. However, they're an icy white, their scales adapted into a feather-like insulating structure that gives them an almost fluffy appearance. Icebeasts are very rare, with only a dozen or so full-sized specimens found throughout Ursa, and a number of younger ones competing for survival. They eat anything they can find, with the smallest subsisting mostly on Ice Mice and the largest struggling to hunt Snow Deer. Horns resembling antlers branch back from their heads, providing a method of signalling to others: only the largest, most mature specimens will have a large set of horns and only the strongest hunters will have a healthy rack. A blue-tipped white tongue often flicks out to taste the snowy air, and these creatures often burrow beneath the snow to sleep. They are at least partially warm-blooded, though can survive being frozen nearly solid.

The Ursa equivalent to Hydra's Sand Worms, the Ice Worm is a very rare creature. As with Icebeasts, only a few live at full-size (some fifteen feet long) at any given time; most kill one another off or starve before they grow so large. Like Sand Worms, they're carnivorous, exoskeletoned worm-like creatures living beneath the snow, tunneling and lying in wait there; generally they remain totally still, sometimes for many cycles, awaiting the vibration of passing prey. Then their bodies shove upward, toppling prey or snagging it in their lamprey-like maw or with powerful pincers to drag them down. Ice Worms are pale, usually whites, grays and light icy blues, and their calcified carapaces are more thickly-covered in bristles than their hot-weather relatives. Given their burrowing habits, Ice Worms are restricted to the deepest snow around the mountains' base and around the lake; an occasional stray can also be found utilizing the glacier tunnels as a burrow.

The workers of the Ursa Hive, these massive ant-like creatures are uniformly pale, with soft, bristly thoraxes and glassy abdomens webbed with white. Though elusive, they can occasionally be found outside the nest's ice tunnel warrens, foraging for food; the rest of the time they spend maintaining the tunnels, caring for their Queen Mother, and raising larvae. Six legs, six eyes and four antennae are situated in a perfectly symmetrical fashion, and any irregular larvae are quickly culled in the nest. Cleaners will attempt to reshape any non-symmetrical living things they aren't actively hunting, using jaws and pincers; this can be fatal to the target. Cleaners secrete a clear substance, which hardens into ice-like amber, to aid in repairing and shaping the ice tunnels. These workers are four feet tall when fully upright, and seven long.

The soldiers of the Ursa Hive, these creatures are even more scarce than Workers--making up only a quarter of the Hive--but incredibly dangerous. Found in matched pairs guarding the inner tunnels, they have larger, mantis-like forelimbs and immense and crushing jaws. The Praetor gives off an acrid stench that invokes a feeling of possibly irrational fear in those who smell it; those who ignore it and move forward to encounter the Praetor will generally be attacked and pursued. The Praetor is programmed to not allow witnesses to escape. A venom found in both jaws and hooked stinger rapidly crystallizes the target, preventing its victim from returning to the chrysalis while simultaneously turning their body into an ice-like crystal. Ominous 'statues' found throughout Ursa's ice tunnels are actually the past victims of Praetor defenses.