don't quite see the point of the tranq arrows for most things, yet. Sure, I was able to knock out a bull and move him. But then he slept for at least 5 minutes before I could even start to feed him. I can just bola him and toss a "pen" around him while bolaed. Bear sleeps even longer and can't be picked up. AND he started running away after 5 arrows, which I then had to chase him down, instead of having him chase me, like normal taming, so he ended up in an even worse spot for taming (if I had wanted to tame him and wasn't just testing).
Maybe for birds, but until they fix the hit boxes of projectiles with birds, I'll just punch a bird and have him follow me into a cage, or drag his bolaed body with a hook.