- Order: Pelagusia
- Suborder: Hard Claw
- Infraorder: Bear Beast
- Family: Zuros
Arzuros seem to live plentifully in temperate to tropical areas. In the Old World they're found in the Misty Peaks, rarely in the Tower and Ruined Ridge. Within the New World they inhabit the Deserted Island and Flooded Forest.
Arzuros are omnivores, meaning they are capable of eating both plants and other animals. They're commonly seen by rivers, hunting fish, and in the forest, searching for certain plants, insects, and carrion. While being large themselves, Arzuros are vulnerable to being attacked and preyed upon by even larger predators in the Misty Peaks such as Zinogre, Rathalos, Rathian, Nargacuga, and the rare Deviljho. When traveling to the Flooded Forest to feed on the vast bounty of fish there, the Fanged Beasts then become vulnerable to attacks from large aquatic predators consisting of Lagiacrus, Gobul, Royal Ludroth, and Plesioth.
An Arzuros will stand on its hind legs to seem much larger to the opponent, much like a real-life grizzly bear. Its front limbs are used as weapons, and are lined with long sharp claws and spikes on its arms that can greatly wound an attacker. It uses them much like many other creatures, by swiping and slashing at its attackers and/or prey. It can also use them to run fast and turn easier when running from predators. Arzuros also have hardened plate-like scales on their backs, and forelimbs. This gives the Arzuros protection from rear assaults and when feeding on bee hives as the stinging and biting insects barely even faze the creatures.
When not being confronted by attackers, Azuros are quite passive and tend to shy away from human contact as humans consider Arzuros a delicacy. They, however, will approach a human if they smell food on them, this can cause trouble as they will be aggressive to gain the food a human is holding, especially if said food is fish. Arzuros also hate being surprised.