Good for taming fiber, but it takes forever to knock one out. You need to go behind his ass(not being sexual) and shoot it with tranqs. It's pretty damn hard to tame one still, but is worth it. It's Torpor is the main help for use, and it does more damage than this wiki tells you at the start. I killed a fucking Bronto with one of these things when I only upgraded its speed. AAA
It literally only took me an hour to tame a level 145 with only 50 mejoberries.
1. Gather berries and put the berries in your last slot
2. Kneel down and walk up to one of them and feed it the berries
3. Now you just follow it around while kneeling down and feeding it berries whenever it's hungry
4. Congratulations you tamed one.
Since they're commonly found in the red wood forest, I recommend only taming one if you're close to water as if you get attacked by something you can jump into the water to get away. Then when you think it's safe just go find your monkey and go back to following/feeding it.