For the person who is asking about beavers spawns in island, i usually go to the redwood river near the swamp, there are beavers there and in hidden lake too. If you dont want to travel everytime, you can carry a beaver by a argy to your nearest river or lake and they will build dams for you :3
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.