Find one of these stony boys. Make sure you have plenty of Tranq arrows, At least 20 tranq arrows or more (Depends on the level). Shoot at the head, don't shoot the body because it has a protective layer of shell and it will lead to a lot of tranq arrows wasted. When it's knocked out, Fill its inventory with berries. After a while, you'll have one of these boys! (Note: You can use a bola if affective but DON'T when it not affective) Hope this helps :)