How to tame :

-Go with a tanky ride (trike, or stego), to a dam

-take anything you'd want from it, and mount back your ride asap

-all near beaver would agro your ride, so you'd just have to tranq them

-feed them with few berries, and tonnes of biotoxines & narcotics

Same interest or thery' but a bit easier to tame & breed

More Castoroides Taming & KO Tips