Creatures!
Gorbs are quadrupedal birds closely related to owlbears, but unlike their cousins they have long wings that serve as arms as well as legs, which gives them ape-like appearance. They have enormous, brightly colored beaks that they use to pick fruit and crack nuts.
-Fire-billed gorb - a large gorb from tropical forests, roughly the size of a gorilla. It is useful as a war beast - matures and grows to full size faster than gorillas. Name derives from its bright orange beak.
-Long-winged gorb - a small, gibbon-like gorb. Valuable as a pet, but that's about it. Climbs faster than it walks.
-Bald-headed gorb - a gorb with a featherless, vibrant blue head. It's roughly the size of a chimp, but it's rather cowardly.
-Fungorb - a gorb with a serrated beak for shredding cavern fungi. It is territorial and easily angered. Appears in small troops and steals food. Can be trained for both purposes.
-Gorb kong - a massive semi-megabeast gorb filled with primal rage. Still, it's just a wild animal and can be tamed. Truly the eight wonder of the world.
Owlbears are still in the concept phase, but I've got a good idea what to do. They are deadly predators with sharp claws on their wings.
-Great owlbear - the basic kind, resembling a huge grizzly bear crossed with a great horned owl. A solitary denizen of temperate forests and mountains. Trainable for war and hunting, and also a mount for daring riders.
-Snowy owlbear - a slightly smaller species, but still huge and prone to rage. They can be encountered in tundras and taigas.
-Sandy owlbear - a small owlbear the size of a large dog. Digs through sand for rodents and other vermin, but will attack anyone who gets too close. Bird-bear honey badger. Lives in deserts, grasslands and savannas.
Running owlbear - a slim owlbear with long legs and wings, resembling a canine rather than a bear. Shows up in a wide variety of tropical biomes.
As soon as I remembered that caverns exist I came up with some variations for existing creatures:
-Blind wyvern - an eyeless wyvern with long, fleshy whiskers. Related to jabberwocks, but it's not quite as large or aggressive. Unlike other wyverns, it lives in flocks up to 5 and can be dangerous if disturbed.
-Foul wyvern - a twisted wyvern with a disturbingly enlarged tongue that serves as the beast's main weapon. Its mouth, tongue and teeth drip with necrotizing venom. Lives deeper underground than blind wyverns.
-Nosferohound - a gigantic, lumbering flederhound, a vampiric flightless bat that can drain a dwarf dry with little more than a bite. Fortunately an average dwarf will easily outrun such monster.