通称：鬣齿兽
物种：鬣齿兽种
时代：始新世晚期和中新世初期
食性：食肉
性情：投机取巧
野生
作为岛上一种锲而不舍的群体狩猎种群，鬣齿兽栖息于山脉与苔原地区，通常是三五成群一同行动。这是一种非常聪明的掠食者，在行动之前，它们会权衡战斗的得益是否值得赌上受伤的风险。 鬣齿兽通常避免战斗，除非附近有虚弱的猎物，或是新鲜的尸体。这种性情切换相当迅速，当附近出现受伤或是垂死的生物时，鬣齿兽会迅速变得极具攻击性，采用非常冷酷的群体攻击手段。 在大嚼猎物的生肉时，鬣齿兽能够快速回复生命值和耐力值。
家养
鬣齿兽体型较小，骑行是不用想了，但其依然是非常具有人气的宠物。它们的高智力意味着可以被很好地训练，而且天生的群体优势能够充当出色的猎犬。 通过进食生肉来快速恢复生命值能确保它们承受大量的伤害并继续战斗。在苔原上常见（也是可怕）的一幕就是：一位骑着恐狼的骑手带着一队鬣齿兽，嚎叫与吼声在夜间不断回响。
Common name: Hyaenodon
Species: Hyaenodon dirus
Time: Late Eocene-Early Miocene
Diet: Carnivore
Temperament: Opportunistic
Wild
Among the Island's most tenacious pack is Hyaenodon dirus, a carnivore most often found across the mountains and tundras in packs of 3 to 6. The Hyaenodon is a very intelligent predator. Before engaging, it determines if the payoff for a fight is worth the risk of injury. Hyaenodon often prefers not to fight unless there is already weakened prey or a fresh carcass nearby. This temperament changes quickly, though, near the presence of injured creatures. Hyaenodon quickly becomes very aggressive... ...and the pack attacks with ruthless abandon. With each vicious chomp of scavenged meat, the Hyaenodon rapidly recovers health and stamina.
Domesticated
Despite being too small to ride, Hyaenodon are still popular pets. Their intelligence means they train well, and their natural pack mentality makes them excellent hunting dogs. Their ability to quickly recover health by consuming raw flesh off the bone ensures they can take punishment yet continue to fight, and they can efficiently preserve meat in specially-crafted saddle-bags. A common (and terrifying) sight on the tundra is a rider on a Canis with a pack of Hyaenodon at its side, howls and jeers echoing through the night.
