If killed or knocked out, they leave a metal battlement and a curved metal battlement in their inventory, so grab it, place it next to your smithy, then demolish (or keep for barrier) to get a ton of metal and cementing paste! Up this so developers can know about this!
Outstanding wood collectors. Mine has 770 weight and can carry 3K wood plus rider. Holds wood at 1/5 weight and can be used as mobile smithy. This teamed with a doed can construct a base in minutes. Must have.
To empty a Beaver dam(always completely empty to allow more to spawn), open Iventory of dam, then immediately close it and jump on a semi quick tame(preferably a bird). The beavers will now follow u anywhere. Lead them far away, or over a ledge then return and empty tha dam. *this has to be done for each individual dam.