There are some concepts for ambient creatures, which is based on available Skyrim's creatures (can use their animations/movements).
Animation\habit : salmon.
Game function : usually hunted animals are source of food and raw material. This creature can be used as a basic weapon: club. Very sad that there is no durability in Skyrim.
Habitat : can live in rivers of Morrowind, but would be better if put it in ash.
2. Curling shrimp
Animation\habit : histcarp/spadetail and other molly-like.
Game function : available source of protein or ingredient.
Habitat : isolated small pools or water in caves.
3. Harlequin bat/bird
Animation\habit : hawk.
Game function : ambient.
Habitat : any non-ash biome.
4. Night lantern (imago of Sharp-clawed caterpillar)
Animation\habit : firefly. it's glowing red and slow ascend at night.
Game function : ambient or source of ingredient.
Habitat : non-ash, open places, perhaps Ascadian Isles.
5. Sharp-clawed caterpillar (larva of Night lantern)
Animation\habit : Horker, but much smaller (smaller than kwama forager).
Game function : very deadly live trap (non aggressive, but deadly if player close to it) and source of deadly poison.
Habitat : perhaps, bitter coast.