Don’t tame them until you have unlocked their saddle or gotten a note for it. Their saddles provide armor and they are useful, I use mine to kill other therizinos because I got lucky and was able to tame a level 209 even though I was at level 36 they are good protection. But unless you have their saddle you cannot harvest things with them. (You could set them on wandering but they don’t harvest that much. There is also the risk of them getting lost) also, another person said you need 70 narcotics. That’s an unreliable number and you would actually need about 400. I also recommend having a trike nearby to gather more narcoberies.

In fewer words. They are great at almost everything. But a hassle to tame