Here’s how I did it.
Step 1. Find low lvl Kapro
Step 2. Run at Kapro
Step 3. Punch Kapro til it faints
Step 4. Shove boa meat down it’s throat
This method worked twice for me, with a lvl 1 and a lvl 3. If you’re going for a high lvl, a crap load a health will see that this method still works
If you have high health and or armor whistle your mount passive first. Then use a spy glass to look for the one you wish to tame. Make sure there are no other Kapros around. If there are snipe them dead then allow the Kapro that you want to tame to knock your off your mount, make sure your mount is following you, and begin shooti n g it with tranq darts or arrows until its asleep then put prime meat in its inventory or mitten.
If your on the island go to the east side of the map. Go to the edge of the swamp and make a trap, even a two by two thatch one will work. Put door frames on the edges of the foundations, then finally a ramp for it to walk up on. You can also use this as a safety area to knock it out from. Vote ^ so others can see!!