If you want the stuff from their dams...don't tame them cause they won't build any more dams! Like so everyone can see :D

Be warned!! I’ve seen 2-3 of these take on a Spino and kill it!

Do not leave unattended the torpor goes down at a monsterous rate

Step 1 find a dam

Step 2 grab all the cementing paste ( useful for later )

Step 3 trap or take castaroides with argenttavis or a trap

Step 4 knock unconscious and feed

Step 5 use the cementing paste and other materials for saddle

Step 6 tame and ride

Step 7 hit a tree and get tons-o-wood

Step 8 your welcome 👍

Strong as hell, especially in packs. Don't put such nice things in your dam if you don't want me to raid it. Jerks.

There is in fact a slot limit! All dinos have 300 slots available

Taming these takes so ‘dam’ long

Ideas if devs dont see this, tame, leave on wander and they should be able to build dams in sources of water.

A Castoroides can be picked up by a argentavis

The method I used to tame was picking up the beaver with my crystal wyvern and dropping it in a taming pen. Pretty easy knockouts but their torpor drop rate is INSANITY and you can't leave then for more than 3 minutes. Feed them either mejoberries or crops (kibble is really expensive but if you want to do that, go for it).

Hope this helps!