1.  A sleen

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

2.  The kaiila

The mount of the Wagon Peoples, unknown in the northern hemisphere of Gor, is the terrifying but beautiful kaiila. It is a silken, carnivorous, lofty creature, graceful, long-necked, smooth-gaited. It is viviparous and undoubtedly mammalian, though there is no suckling of the young. The young are born vicious and by instinct, as soon as they can struggle to their feet, they hunt. It is an instinct of the mother, sensing the birth, to deliver the young animal in the vicinity of game. I supposed, with the domesticated kaiila, a bound verr or a prisoner might be cast to the newborn animal. The kaiila, once it eats its fill, does not touch food for several days.  Nomads of Gor

3.  The tarn and the high tharlarion

The tarn is one of the two most common mounts of a Gorean warrior; the other is the high tharlarion, a species of saddle-lizard, used mostly by clans who have never mastered tarns.  Outlaw of Gor

4.  "Tabuk!"

The cry of 'Tabuk!' is used by the tarnsman on long flights when time is precious, and he does not wish to dismount and free the bird to find prey. When he spots a tabuk in the fields below, or, indeed, any animal in the prey range of the tarn, he may cry 'Tabuk!' and this is the signal that the tarn may hunt. It makes its kill, devours it, and the flight resumes, the tarnsman never leaving the saddle. This was the first time I had called 'Tabuk!' but the bird would have been conditioned to the call by the tarn-keepers of Ko-ro-ba years ago, and might still respond.  Outlaw of Gor

5.  A frevet

"That is a frevet." The frevet is a small, quick, mammalian insectivore. "We have several in the house," he said. "They control the insects, the beetles and lice, and such."  Mercenaries of Gor

6.  The sleen

"Perhaps," I admitted.
"You should thank the sleen for letting himself be harpooned by you," said Imnak. "Not every sleen will do that."
"Thank you, Sleen," I said.
"Good," said Imnak. "That is a simple courtesy. You surely cannot expect sleen to come over to be harpooned if you are not even going to be civil to them."
"I guess you are right, Imnak," I said.
"Of course I am right," said Imnak. "Sleen have their pride."
We had then arrived at the two sleen he had left floating in the water, beneath whose hides he had blown air. He deferentially thanked the two sleen for having permitted themselves to be slain by him. Then he tied them behind his kayak and, together, paddling, we headed back toward the pebbled shore.
"When the sleen are dead, how can you expect them to know they are thanked?" I asked.
"That is an interesting and difficult question," said Imnak. "I do not really know how the sleen manage it."
"It seems it would be hard to do," I said.
"It is a belief of the People," said Imnak, "that the sleen does not really die but, after a time, will be reborn again."
"The sleen is immortal?" I asked.
"Yes," said Imnak. "And when he comes again he will hopefully be more willing to let himself be harpooned again if he has been well treated."
"Are men. too, thought to be immortal?" I asked.
"Yes," said Imnak.
"I know a place," I said, "where some people would think that men are immortal but animals are not."
"They do not like animals?" asked Imnak.
"I do not know," I said. "Perhaps they think they are immortal because they are smart and sleen are not."
"Some sleen are pretty smart," said Imnak. He thought for a bit. "If sleen were to talk these things over," he said, "they would probably say that they were immortal and men were not, because they were better at swimming."  Beasts of Gor

A typical Kurii foraging squad consists of six animals, called a "hand," with its "eye," or leader. Two such "hands" with their "eyes," constitutes a "Kur," or "Beast." The military Kur, in this sense a unit, is commanded by a "Blood" This seems peculiar perhaps but is explained by ancient Kurii belief, that thought is a function of the blood. One "thinks" thus with one's entire body, not just the brain.7.  Blood

A  Marauders of Gor

"Why is the leader spoken of as a Blood?' asked Samos.
"It seems to have been an ancient belief among such creatures," I said, "that thought was a function of the blood, rather than of the brain, a terminology which has apparently lingered in their common speech. Similar anachronisms occur in many languages, including Gorean."
"Who commands a People?" asked Samos.
"One who is said to be a 'Blood' of the People, as I understand it," I said.
"How do you know that one of these is a 'Blood,' asked Samos.
"The left wrist of the larger animal bears two rings, rings of reddish alloy," I said. "They are welded on the wrist. No Gorean file can cut them."
"He is then of high rank?" asked Samos.
"Of lower rank than if he wore one," I said. "Two such rings designate the leader of a Band. He would have a ranking, thusly, of the sort normally accorded to one who commanded one hundred and eighty of his fellows."
"He is analogous to a captain," said Samos.
"Yes," I said.
"But not a high captain," said Samos.
"No," I said.
"If he is a Blood, then he is almost certainly of the steel ships," said Samos.
"Yes," I said.
"The other," said Samos, "wears two golden rings in its ears.
"It is a vain beast," I said. "Such rings serve only as ornaments. It is possible he is a diplomat."
"The larger beast seems clearly dominant," said Samos.
"It is a Blood," I said.
There was a broad leather strap, too, running from the right shoulder to the left hip of the smaller of the two creatures. I could not see what accouterment it bore.
"We have greeted them," said Samos. "Why do they not speak?"  Savages of Gor

8.  Vart: blind, bat-like flying rodent, about the size of a small dog

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... Outlaw of Gor

Vart, Brown - Carnivorous animals that rest clinging upside down on branches.

...I could, however, recognize a row of brown varts, clinging upside down like large matted fists of teeth and fur and leather on the heavy, bare, scarred branch in their case.... Priest-Kings of Gor

Vart, Jungle - A relative of the northern vart, it inhabits the rain forests inland of Schendi.

..."In the lower branches of the "ground zone" may be found, also, small animals, such as tarsiers, nocturnal jit monkeys, black squirrels, four-toed leaf urts, jungle varts and the prowling, solitary giani, tiny, cat-sized panthers, not dangerous to man.... Explorers of Gor

9.  Sable

The great bird seemed to sense what I intended, or perhaps it was merely his sudden realization that the other tarn was in the lead, but a remarkable transformation swept over my sable, plumed steed.  His neck straightened and his wings suddenly cracked like whips in the sky; his eyes became fiery and his every bone and muscle seemed to leap with power.  In a dizzying minute or two we had passed the Older Tarl, to his amazement, and had settled again in a flurry of wings on the top of the cylinder from which we had departed a few minutes before.
"By the beards of the Priest-Kings," roared the Older Tarl as he brought his bird to the roof, "that is a tarn of tarns!"  Tarnsman

10.  Not always.  Most times mention of River Tharlarion is herbivorous, however in a later book, one is clearly witnessed consuming a fish, thereby making at least this particularly variety if not all River Tharlarion omnivorous, if not some carnivorous.

"I crossed the Cartius on a barge, one of several hired by the merchant of the caravan with which I was then seeing. These barges, constructed of layered timbers of Ka-la-na wood, are towed by teams of river tharlarion, domesticated, vast, herbivorous, web-footed lizards raised and driven by the Cartius bargemen, fathers and sons, interrelated clans, claiming the status of a cast for themselves. Even with the harnessed might of several huge tharlarion drawing toward the opposite shore the crossing took us several pasangs downriver. The caravan, of course, was bound for Turia."  Nomads of Gor

"A broad, low-sided barge began to back toward the pier. It had two large steering oars, manned by bargemen. It was drawn by two gigantic, web-footed river tharlarion. There were the first tharlarion that I had ever seen. They frightened me. They were scaled, vast and long-necked. Yet in the water it seemed, for all their bulk, they moved delicately. One dipped its head under the surface and, moments later, the head emerged, dripping, the eyes blinking, a silverish fish struggling in the small, triangular-toothed jaws. It engorged the fish, and turned its small head, eyes now unblinking, to regard us. They were harnessed to the broad barge. They were controlled by bargemen, with a long whipping stick, who was ensconced in a leather basket, part of the harness, slung between the two animals. He would also shout at them, commands, interspersed with florid Gorean profanity, and, slowly, not undelicately, they responded to his cries. The barge grated against the pier. …  Captive of Gor