Dododex
ARK: Survival Evolved Companion

Tips & Strategies

Try using sugar cane to tame. Around 100 cane tamed a level 8 in 5-10 mins. Primitive + for the win.
More Castoroides Taming & KO Tips
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
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.
To tame these guys use galli kibble, and bring at least a stack of narcotics or toxin for a higher lvl, Very helpful when you need wood
There is in fact a slot limit! All dinos have 300 slots available
Taming these takes so ‘dam’ long
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!
A Castoroides can be picked up by a argentavis
Make sure no other Castoroides are around then bola it and shoot it with tranqs until it knocks out. Make sure you bring loads of bio toxin, because their torpor drains fast. I used this method and tamed one at level 42