Animals comprise various mundane creatures that have no magical or weapon-wielding abilities.
The "Animals" category includes a wide variety of creatures, with different degrees of aggressiveness (some have no attack capability at all), and many different habitats. The characteristics common to all animals are that they are modeled upon real animals that exist (or existed formerly) on Earth, and that they rely exclusively upon physical attacks using their bodies (claws, paws, hooves, fangs, horns, etc.)
Animal behavior is organized into three ranks: Non-hostile, in which the animal will never attack (these also are always level 1 and die in one hit); Neutral, in which the animal will only attack when provoked by proximity or direct harm; and Hostile, in which the animal will attack on sight. Note that in certain places, an animal may be neutral while others of its kind elsewhere are hostile. There are also a few cases of two distinctly different animals having the same name. For example, the small, non-hostile spider may be killed for bait, while the large, hostile spider has more variable drops (such as Armor or Weapons).
Bears are large mammals found in Valenwood and Skyrim. They are dangerous predators with thick fur that is well-suited for keeping people warm.
Crocodiles are large reptiles that can be found near water. They have powerful jaws.
Dunerippers are large beasts that travel fastest by digging. They are found in desert regions.
Netches are docile, floating creatures found in Morrowind. A male netch is called a bull, and a female is called a betty. Juvenile netches are called calves.
Kwama Warriors are large kwama who exist to defend their hive. Unlike other varieties of kwama, they are bipedal.
Mammoths are large, woolly animals found in cold climates. They are located in Skyrim and some parts of Valenwood.
Sabre Cats are large felines famous for their long fangs. They thrive in Skyrim.
Senche are large felines found in Elsweyr and Valenwood. There are many different kinds of senche, including senche-tigers, senche-leopards, senche-panthers and senche-lions.
Skeevers are large rodents found throughout Tamriel.
Terror Birds are large birds that are found in Elsweyr. They tend to live in large groups, and are carnivores.
Wolves are large canines usually found in wooded areas.
Guar are bipedal reptiles that are kept as pets and livestock. They are found primarily in Morrowind and Black Marsh.
Kwama Workers are kwama that dig for their hives. They are capable of defending themselves if provoked.
For a more extensive list of non-hostile animals, see Passive Creatures.