If you wanna tame one of this bad boys you either get tranqs or just slingshot them(it will take a while tho) if you have a crossbow i recommend that. Get berrys (i recommend getting narcotics like atleast 20+) and feed so i wouldn't lose torpor. If you wanna get alot of berries thatch wood and fiber get a mochops put it a place where theres alot of fern and bushes and put them on wandering then let them be for a while it will get you alot of berries. (If you have alot of tranqs get a high level one atleast 70+) it could gather rockcarrots and can kill a theriz if its high level put stats on stamina damage, speed or health. Thats it :)