Bosk
A huge, shaggy, ox-like animal that provides, meat, milk and leather.  It is a symbol of the Wagon Peoples.
"...or the ill-tempered, cumbersome bosk, a shaggy, long-haired wild ox of the Gorean plains."
Outlaw of Gor, page 125
*
Carp (Vosk Carp)
"...turning as it made a swift strike, probably a Vosk carp or marsh turtle."
Raiders of Gor, page 1
*
Cosian Wingfish
"...I heard the mating whistles of the tiny, lovely Cosian wingfish. This is a small, delicate fish; it has three of four slender spines in its dorsal fins, which are poisonous. It is called the wingfish because it can, on its stiff pectoral fins, for short distances, glide through the air, usually in an attempt to flee small sea thalarion, who are immune to the poisonous spines. It is also called a songfish, because, in their courtship rituals, males and females thrust their head from the water, uttering a kind of whistle."
Raiders of Gor, page 139
*
Dock Eels
Black eels...roughly four feet in length, weighing 8 to 10 pounds.  They are ferocious hunters and are attracted by blood.  They can gouge ounces of flesh in one bite.
" When he stood in about a foot of water, among the pilings, near the next wharf, he struck down madly at his legs with his left hand, striking two dock eels from his calf."
Rogue of Gor, page 154
*
Gant
Jungle Gant:
Marsh Gant:
" I heard a bird some forty or fifty yards to my right; it sounded like a marsh gant, a small, horned, web-footed aquatic fowl, broad-billed and broad-winged. Marsh girls, the daughters of rence growers, sometimes hunt them with throwing sticks."
Raiders of Gor, page 4
*
Gim
Horned Gim:
"The migration of the forest hurlit and the horned gim do not take place until late in the spring."
Nomads of Gor, page 138
*
Golden Beetle
Found in the Nest of the Priest-Kings. It gives off an odor that acts as a narcotic to the Priest-Kings and hypnotizes them, luring them to their deaths.
" 'What does the Golden Beetle kill?' I asked.  'Priest-Kings,' said the second slave."
Priest-Kings of Gor, page 105
*
Grunt
Blue Grunt:
White Grunt:
A large game fish
"Before each guest there were tiny slices of tospit and larma, small  pastries, and in a tiny golden cup, with a small golden spoon, the clustered, black, tiny eggs of the white grunt."
Fighting Slave of Gor, pages 275-276
*
Gull (Vosk Gull)
" 'Those are Vosk gulls,' said Kamchak, 'In the spring, when the ice breaks in the Vosk, they fly north.' "
Nomads of Gor, page 137
*
Hith
The Gorean Python
"In another case, somnolent and swollen, I saw a rare golden hith, a Gorean python whose body, even when unfed, it would be difficult for a full-grown man to encircle with his arms."
Priest-Kings of Gor, page 191
*
Hurlit
"The migration of the forest hurlit and the horned gim do not take place until late in the spring."
Nomads of Gor, page 138
*
Hurt
Provides wool, thought to be kangaroo like?
"...wool from the bounding Hurt..."
Tribesmen of Gor, page 37
"Two peasants walked by, in their rough tunics, knee-length, of the white wool of the Hurt."
Tribesmen of Gor, page 47
*
Jards
Gorean vultures
"Fluttering jards, covering many of the carcasses like gigantic flies, stirred, swarming upward as Inmak passed them, and then returned to their feeding."
Beasts of Gor, page 170
*
Kaiila
A large reptile looking animal, used by the Wagon Peoples and in the Tahari as a mount. The Kaiila is well-suited for the harsh conditions of the Tahari and the Plains. Its viciousness makes it a formidable mount for a Warrior as well.   
"The mount of the Wagon Peoples, unknown in the northern hemispheres of Gor, is the terrifying but beautiful kaiila. It is a silken, carnivourous, lofty creature, graceful, long-necked, smooth gaited. It is viviparous and undoubtedly mammalian, though there is no suckling of the young...The kaiila is extremely agile...normally stands about tweny to twenty-two hands at the shoulder, can cover as much as six hundred pasangs in a single day's riding. The head of the kaiila bears two large eyes, one on each side, but these eyes are triply lidded probably an adaptation to the environment which occasionally is wracked by severe storms of wind and dust; the adaptation, actually a transparent third lid, permits the animal to move as it wishes under conditions that force other prairie animals to back into the wind, or like the sleen, to burrow into the ground."
Nomads of Gor, pages 13-14
*
Kailiauk
Another plains bison-type animal. The descriptions make it seem related to the bosk, though with more horns.  The kailiauk is a 'symbol' to the Red Savages much as the bosk is to the Wagon Peoples...perhaps the differences in the two are related more to the climates they inhabit?
"I looked beyond Hci to the beasts, some two to three pasangs away. The kailiauk is a large, lumbering, shaggy, trident-horned ruminant. It has four stomachs and an eight valved heart. It is dangerous, gregarious, small eyed and short tempered. Adult males can stand as high as twenty or twenty five hands at the shoulder and weigh as much as four thousand pounds."
Blood Brothers of Gor, page 10
*
Kur
In Torvoldsland, the word Kur means beast. Kurii eat humans and are the enemies of Goreans. Cabot spends much of his time in several of the books fighting Kurii.
"In the doorway, silhouetted against flames behind them, we saw great, black, shaggy figures."
Marauders of Gor, page 203
"Its head was approximately the width of the chest of a large man. It had a flat snout, with wide nostrils. Its ears were large, and pointed....The beast was approximately nine feet in height; I conjectured its weight in the neighborhood of eight or nine hundred pounds. Interestingly, Priest-Kings, who are not visually oriented organisms, find little difference between Kurii and men...One difference they do remark between the human and the Kur,and that is that the human,commonly, has an inhibition against killing. This inhibition the Kur lacks."
Marauders of Gor, pages 169-170
*
Kite
" 'The first southern migrations of meadow kites,' he said, 'have already taken place.'"
Nomads of Gor, page 138
*
Larl
Resembles the large jungle felines of Earth...tigers, lions and the like. They cannot be tamed.
"The larl is a predator, clawed and fanged, quite large, often standing seven feet at the shoulder. I think it would be fair to say that it is substantially feline; at any rate its grace and sinuous power remind me of the smaller but similarily jungle cats of my old world....The larl's head is broad, sometimes more than two feet across, and shaped roughly like a triangle, giving its skull something of the cast of a viper's save that of course it is furred and the pupils of the eyes like the cat's...the pelt of the larl is normally a tawney red or sable black. The black larl, which is predominately nocturnal, is maned, both male and female. The red larl, which hunts whenever hungry, regardless of the hour, and is the more common variety, posesses no mane."
Priest-Kings of Gor, page 18
*
Lelt
A small, blind white fish which inhabits the brine pits at Klima.
"The lelt is commonly five to seven inches in length. It is white and long-finned."
Tribesmen of Gor, page 247
"Lelts are often attracted to the salt rafts, largely by the vibrations in the water, picked up by their abnormally developed lateral-line protrusions, and their fernlike craneal vibration receptors, from the cones and poles. Too, though they are blind, I think either the light, or the heat, perhaps, from our lamps, draws them. The tiny eyeless heads will thrust from the water, and the fernlike filaments at the side of the head will open and lift, orienting themselves to one or the other of the lamps."
Tribesmen of Gor, page 247
*
Marsh Turtle
"...turning as it made a swift strike, probably a Vosk carp or marsh turtle."
Raiders of Gor, page 1
*
Ost
A small, venomous snake whose bite will cause a painful death within seconds. Commonly they are bright orange, but the banded ost is yellowish orange with black rings. Both are poisonous.
"One to be feared even more perhaps was the tiny ost, a venomous, brilliantly orange reptile little more than a foot in length, whose bite spelled an excruciating death within seconds."
Outlaw of Gor, page 26
*
Parsit Fish
A small, silvery striped fish commonly used (cut up and raw) in the bond-maid gruel of Torvordsland. It is also salted or dried and sold to more southern cities.
"The main business of Kassau is trade, lumber and fishing. The slender striped parsit fish has vast plankton banks north of the town, and may there, particularly in the spring and the fall, be taken in great numbers."
Marauders of Gor, page 27
*
Qualae
Three-toed, dun colored mammals with stiff brushy manes of black hair.
"I saw what I first thought was a shadow, but as the tarn passed, it scattered into a scampering flock of tiny creatures, probably the small, three-toed mammals called qualae, dun-colored and with a stiff, brushy mane of black hair."
Tarnsman of Gor, page 141
*
Rennels
Poisonous, crab-like desert insects.
"...that once an army of a thousand wagons turned aside because a swarm of rennels, poisonous, crablike desert insects, did not defend its broken nest..."
Nomads of Gor, page 27
*
Salamanders
Inhabiting the brine pits along with the lelts;  the salamanders are also white and blind. Unlike the lelts, though, salmanders have legs and external gills.
"Among the lelts, too, were, here and there, tiny salamanders, they, too, white and blind. Like the lelts, they were, for their size, long-bodied, were capable of long periods of domancy and posessed a slow metabolism, useful in an environment in which food is not plentiful. Unlike the lelts, they had long stemlike legs....but the filaments, in the case of the salamanders, interestingly, are not vibration receptors, but feather gills, an external gill system."
Tribesmen of Gor, pages 247-248
*
Salt Leaches
"I flicked a salt leach from the side of my light rush craft with the corner of the tem-wood paddle."
Raiders of Gor, page 5
*
Sand Flies
"Following such rains, great clouds of sand flies appear, wakened from dormancy. These feast on kaiila and men. Normally, flying insects are found only in the vicinity of the oases."
Tribesmen of Gor, page 152
*
Shark
There are several varieties of shark on Gor; the marsh and river sharks as well as the salt shark that inhabits the brine pits of Klima. The marsh shark is eel-like, long, and has nine gills. The river shark is black with triangular dorsal fins and lives in the fresh waters of Gor. The salt shark is white, blind, and also has a dorsal fin and is nine gilled.
"Beyond them would be the almost eel-like, long-bodied, nine-gilled Gorean marsh sharks."
Raiders of Gor, page 58
*
Sleen
Six-legged, furred mammal. Used to track, hunt, guard herd of bosk (and slave girls) and also to herd slave girls. There are forest and prairie sleen as well as the snow and sea sleen on Gor.
See a depiction of a sleen, drawn by slipper{MW},  here.
"It is at night that the sleen hunts, that six-legged, long-bodied mammalian carnivore, almost as much a snake as an animal."
Outlaw of Gor, page 26
*
Slime Worm
"We had not walked far when we passed a long, wormlike animal, eyeless, with a small red mouth, that inched its way along the corridor, hugging the angle between the wall and the floor....
'What do you call it?' I asked.
'Oh,' said one of the slaves, 'it is a Slime Worm.'...
'It scavenges on the kills of the Golden Beetle...' "
Priest-Kings of Gor, pages 105-106
*
Sorp (Vosk Sorp)
A shellfish, oyster-like
"Ho-Hak looked at the man who wore the headband of pearls of the Vosk sorp."
Raiders of Gor, page 21
"He sat upon a giant shell of the Vosk sorp, as on a sort of throne, which for these people, I gather it was."
Raiders of Gor, page 14
*
Swamp Spiders
Actually these are known as the Spider People. They are rational and speak to humans through the use of a translator device.  They are large spiders that live in the swamps near Ar.
"Approaching me, stepping daintily for all its bulk, prancing over the strands, came one of the Swamp Spiders of Gor....and I caught sight of the mandibles, like curved knives...He then backed away from me on his eight legs...I saw then for the first time that strapped to his abdomen, was a translation device....They hunt us and leave only enough of us alive to spin the Cur-lon Fiber used in the mills of Ar."
Tarnsman of Gor, pages 81-83
*
Tabuk
Two varieties inhabit Gor; the smaller yellow tabuk of the plains, and the larger Northern Tabuk. Both are hunted for meat and hides.
"They were northern tabuk, massive, tawny and swift; many of them ten hands at the shoulder, a quite different animal from the small, yellow-pelted antelope-like quadruped of the south. On the other hand, they too were distinguished by the single horn of the tabuk.  On these animals, however, that object, in swirling ivory, was often, at its base, some two and one half inches in diameter, and better than a yard in length. A charging tabuk, because of the swiftness of its reflexes, is quite a dangerous animal."
         Beasts of Gor, page 152
*
Tarn
The large, winged mounts of the Warrior Tarnsmen of Gor. The birds resemble hawks of Earth, only much much larger. The birds are vicious and fierce. They are carnivorous, and sometimes turn on their own riders. War tarns commonly have armored talons and are trained to serve not only as a mount, but as a weapon in their own right. Racing tarns are lighter and trained for the racing arena.
" Though the tarn, like most birds, is surprisingly light for its size, this primarily having to do with the comparative hollowness of the bones, it is an extremely powerful bird, powerful even beyond what one would expect from such a monster. Whereas large Earth birds, such as the eagle, must, when taking flight from the ground, begin with a running start, the tarn with its incredible musculature, aided undoubtedly by the somewhat lighter gravity of Gor, can with a spring and a sudden flurry of its giant wings lift both himself and hi rider into the air. In Gorean, these birds are sometimes spoken of as Brothers of the Wind.
The plumage of tarns is various, and they are bred for their colors as well as their strength and intelligence. Black tarns are used for night raids, white tarns in winter campaigns, and multicolored, resplendent tarns are bred for warriors who wish to ride proudly, regardless of the lack of camouflage. The most common tarn, however is greenish brown. Disregarding the disproportion in size, the Earth bird which the tarn most closely resembles is the hawk, with the exception that it has a crest somewhat of the nature of a jay's.
Tarns, who are vicious things are seldom more than half tamed and, like their diminutive earthly counterparts, the hawks, are carnivorous. It is not unknown for a tarn to attack and devour his own rider. They fear nothing but the tarn-goad.."
Tarnsman of Gor, pages 51-52
*
Tarsk
Resembles the Earth pig. It has six tusks and is wild (like the wild boar) although there are also domestic tarsks. Used primarily for meat.
"I thought of the yellow Gorean bread, baked in the shape of round, flat loaves, fresh and hot; my mouth watered for a tabuk steak or, perhaps, if I were lucky, a slice of roast tarsk, the formidable six-tusked wild boar of Gor's temperate forests."
Outlaw of Gor, page 76
*
Thalarion
A lizard like animal used in various ways. Thalarions inhabit many parts of Gor; there exist High Thalarions, used by Warriors, they are carnivorous; Broad Thalarions, used as draft animals are not carnivorous; River Thalarions, also used as draft animals to pull the barges on the rivers, though there is one type of river thalarion, called a Mamba, both of which are carnivorous; a predator;Rock Thalarions, a small reptile of the Tahari; and Water Thalarions, which inhabit the marshes, these, too, are carnivorous. Thalarion fat is rendered to make lamp oil.
" The high thalarions, unlike their draft brethren, the slow-moving, four-footed broad thalarions, were carnivorous."
Tarnsman of Gor, page 125
*
Tumit
Large, flightless, carnivorous birds of the plains.
"...beyond them I saw one of the tumits, a large, flightless bird whose hooked beak, as long as my forearm, attested only too clearly to its gustatory habits; I lifted my shield and grasped the long spear,  but it did not turn in my direction; it passed, unaware;..."
Nomads of Gor, page 2
*
Ul
A predatory, winged thalarion, pterodactyl-like
"Also, at night, crossing the bright disks of Gor's three moon,  might ocassionally be seen the silent, predatory shadow of the ul, a giant pterodactyl ranging far from its native swamps in the delta of the Vosk."
Outlaw of Gor, page 26
*
Urt
A rodent/rat-like animal that can be quite large or small. Like mice and rats, it is able to live in just about any environment; such as sewers or forests alike.
"It was  a giant urt, fat, sleek and white; it bared its three rows of needlelike white teeth at me and squealed in anger; two horns, tusks like flat crescents curved from its jaw; another two horns, similar to the first, modifications of the bony tissue forming the upper ridge of the eye socket, protruded over those gleaming eyes that seemed to feast themselves upon me..."
Outlaw of Gor, page 86
*
Vart
A batlike flying rodent, often the size of a small dog. It is blind, and carnivorous.
"Perhaps most I dreaded those nights filled with the shrieks of the vart pack, a blind, batlike swarm of flying rodents, each the size of a small dog. They could strip a carcass in a matter of minutes...Moreover, some vart packs were rabid."
Outlaw of Gor, page 26
*
Verr
Mountain goat/goat like animal used for milk and meat. Some are domesticated.
"...perhaps after the agile and bellicose Gorean mountain goat, the long haired, spiral horned verr..."
Tarnsman of Gor, page 147
*
Vulo
Domesticated pigeonns used for eggs and meat.
"She was a peasant, barefoot, her garment little more than coarse sacking.  She had been carrying a wicker basket containing vulos, domesticated pigeons raised for eggs and meat."
Nomads of Gor, page 1"
*
Zadit
A bird of the Tahari. Feeds on the sand flies and other insects that infest the kaiila.
"The zadit is a small, tawny-feathered, sharp-billed bird. It feeds on insects. When sand flies and other insects, emergent after rains, infest kaiila, they frequently light on the animals, and remain for some hours, hunting insects. This relieves the kaiila of the insects but leaves it with numerous small wounds, which are unpleasant and irritating, where the bird had dug insects out of its hide."
Tribesmen of Gor, page 152
*
Zarlit Fly
Resembles a large dragonfly; and is harmless
"I did see a large, harmless zarlit fly, purple, about two feet long with four translucent wings, spanning about a yard, humming over the surface of the water, then alighting and, on its padlike feet, daintily picking its way across the surface."
Raiders of Gor, page 5