For beginners wanting to tame this thing (before tranq arrows): I have found 4-6 slingshots and a ridiculous amount of stone is suitable enough to knock one of these guys out. Make sure to bait it out of the water long & far enough so once they start running they will be to far away. Making a small thatch trap is also useful as it will help you secure some more hits even though it will eventually break it. I have found this method to only be viable though with Level 50 and lower Sarcos but as a beginner tame they are ridiculously good.