Lungfish, a giant amphibious carp!!!
Koala, it sits in a tree and never moves...(to be fair, koalas do actually move, but reality is less fun)
Platypus, it causes strange moods in dwarves who try to understand its alien geometries...
Echidna, vermin, eating them causes fatal injuries.
Lyrebird, causes a bunch of fake elf entries in the unit list.
Bower bird, steals things based on colour.
Bilby, vermin, tastes like chocolate...
Tasmanian devil, harmless unless provoked, eats bones, eats skulls, eats skin, eats leather, eats chunks, eats soap... ... ...
Rabbit, breeds like cats...
Giant dwarf-eating plant, giant, eats dwarves, immobile...
Moray eel, like carp, but bigger.
Kangaroo, large, agressive, can decapitate a stout dwarf with a single kick.
Hopping nuke, it hops, and starts fires.
Scarab, performs cleaning tasks.
Wallaby, like a kangaroo, except harmless.
Paddy melon, like a wallaby, except harmless.
Drop bear, like a koala, drops out of trees, composed of super-dense materials.
Possum, like a paddy melon, except tears dwrves limb-from-limb, and steals stuff.
Sugar glider, invisible, flies, steals, unbearably cute.
Cassowary, big, mean, bird, mean, can slice a dwarf in twain lengthways...
Earth, mostly harmless.
Crown of thorns, aquatic vermin, kills aquatic animals.
Penguin, vermin, tasty, has no value whatsoever, widely regarded to be rude and offensive.*ducks*
Wombat, small, tough, usually harmless.
Godzilla.
Gamera.
King Kong.