You can find their dams by rivers going out to ocean, unless youre on a server where small tribes build right where they spawn
Castoroides

Player-written tips for taming, using, and fighting the Castoroides in ARK: Survival Ascended & Evolved.
Can be carried by a quetzal and will gather wood at the same time! Just drive it up to the tree and use x (default) to stop the quetzal! Make sure the castoroides is close to the tree. Takes a little practice but once you get it down it's easy!
Tamed a carchar just to kill those things muahahaha (evil laugh) kept one trapped for cementing paste, thats slavery at its finest
These things are ANAZING at getting Narcoberries!!!! I don’t know why they’re not listed, but they’re great.
for the guy that said trap them instead taming them for dams, i tried it and it didn't work. made 3 or 4 and no dams
100% Recomended to farm wood, it has a 50% weight decrease for wood and tahtch on his inventory, if you are playing ARK Mobile Ultimate, the tame rate for local singleplayer is x2.5
Does it eat you?
Please tell me idk what to do because I won’t go in my house because of the weird beaver thing,
I found it in my basement of my house,
Map name: The Island
Help me!
On mobile a wild beaver's initial oxygen is 380, and increases by 38 every level
These motherflufers are EVIL if you take some rare flowers from its den it go BEAST mode on you remember that if you see it’s den don’t steal from it
if you want to take things from its dam, BE PREPARED!!! They will hunt you down after you take their stuff, and they won't stop hunting you until your dead, or it's dead.
If you have an Argentavis, you can grab a wild Castoroides and plop him in a preprepared enclosure near your base. We originally planned to tame him in there.
Turns out, if you don't tame him, he will eventually build a dam inside the enclosure that you can easily…
If you have an Argentavis, you can grab a wild Castoroides and plop him in a preprepared enclosure near your base. We originally planned to tame him in there.
Turns out, if you don't tame him, he will eventually build a dam inside the enclosure that you can easily harvest from outside the fence. You just have to tranq him afterwards or he will go and destroy the fence.
YOU NEED NARCOTICS don’t make the same mistake I did
Make sure to have a lot of narcotics
I thought it was a cute little thing….. then came the teeth and claws. Don’t break into dams as a noob. You’ll regret it.
Beavers can be picked up by an argent/quetz and will auto collect wood!
Narcoberries are great for keeping this guy unconscious. 2 narcoberries equal one narcotic, so 100 of em equals 50. Far less expensive to get a lot of berries than to make a lot of narcotics.
in the tannery the saddle cost 1650 cures
Do not clear out the dam or you’ll be eaten!!
if you want to tam one go to a peak they can’t reach and tranq with darts once down
pump 100 narc berries and 100 other berries into constantly don’t leave it’s side as it’s torq goes down insanely fast!
Definitely tame one of these if you need more wood. There pretty easy too tame just make a basic trap and lead this guy right into it. It’ll take a couple arrows but once it’s knocked out give it crops, mojos with this guys take soooo long.
I wasted almost all my tranq arrows (I had like 70) to knock out a really high level beaver and I died probably like 20 times but it was all worth it because now I got a really powerful tame that none of my other tames can even compare to