The Castoroides is tamed by isolating or relocating it, then using a bola and tranquilizer weapons before feeding it kibble, crops, or berries; its torpor drops quickly, so narcotics or biotoxin and protection are essential. As a mount, it gathers and carries wood efficiently, reduces the weight of common building materials, and provides a mobile smithy with solid mobility and combat ability. Wild Castoroides construct resource-filled dams, but disturbing them can provoke nearby beavers. Approach cautiously, avoid fighting groups or in water, and separate individuals or use ranged attacks and a powerful mount when necessary.