通称：巨河狸
物种：巨河狸目
时代：上新世晚期-更新世晚期
食性：食草动物
性情：友好的
野生
巨河狸是生活在水边的大型草食哺乳动物。和其他的大型海狸物种不同，巨河狸保留现代海狸的凿形齿。 作为海狸共性，巨河狸建造堤坝作为栖息地，但却经常被更大体型的岛上生物所践踏。因此，在野外找到未被破坏过且资源丰富的堤坝是相当罕见的。 巨河狸本身似乎没有意识到这个岛到底有多么的危险。我不清楚它们是太愚蠢了，没有注意到危险，还是只是不在乎… …不过巨河狸整天都在开心的泡在水里玩和啃木头。
家养
巨河狸被驯养的价值在其本能。这种生物可以非常有效地收集木材，其效率远远超过岛上的大多数物种。巨河狸不够强壮，因此它的负重较差，但它是天生的伐木工人！巨河狸的鞍还可兼作移动制作台，让骑手可以一边行进一边制作复杂物品。
Common name: Castoroides
Species: Castoroides feliconcisor
Time: Late Pliocene-Late Pleistocene
Diet: Herbivore
Temperament: Friendly
Wild
Castoroides feliconcisor is a large, mammalian herbivore that tends to live near water. Unlike other larger beaver species, this one retains the chisel-shaped teeth of modern beavers. As is typical for beavers, they build dams as habitats, but the larger creatures on the Island have a tendency to trample them. As a result, finding unsullied, resource-rich dams in the wild is quite rare. Castoroides itself doesn't seem to realize how dangerous the Island is. I don't know if it's simply too dumb to notice the dangers, or if it just doesn't care... ...but Castoroides happily goes about its day playing in the water and gnawing on wood.
Domesticated
The value of a tamed Castoroides is obvious from its physiology. The creature naturally gathers wood extremely efficiently, far more than most species on the island. It's not the strongest creature, so it can only carry limited amounts, but it is a natural lumberjack! Its saddle doubles as a mobile crafting station, which allows for producing complex items on the go.
