Unlike the extant American Beaver, we have no evidence that Giant Beavers (Castoroides ohioensis) built dams. The Giant Beaver was around the size of a black bear. : r/Naturewasmetal
Giant Beaver Dam - ARK Official Community Wiki
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Fat Frog's Swamp Gas Gaming: Where to Find Beaver Dams on Ragnarok
Beaver Dam locations on the Island Map: Ark Survival Evolved Castoroides - YouTube