Make sure to have friends at least one other to be on a bird and carrying you so you can shoot it with tranq arrows or darts at a safe height because these things of life do major damage and it would be bad to get count by a few trying to tame one.
Check-out this on your game
Take a ride of mammoth then go under water with it. Then come out from water . Then you can see in your right, there comes (ready to spray)
Then you have to long press on right . The mammoth will spray water . You can stunned any flier. And you can also fill the crops with water. Please press the good button for some respect for me.
I found a lvl 140 mammoth. Up = tame, down = no
This is completely unrelated but if you put level 9999 and taming 0.01 it would take almost 42 million stimberries
' Whoever suggests taming a mammoth with 2k+ stimberries, you're an idiot'
Quote from my wife
So we have Manny and Diego now we need Sid.
Knocking it out was the easy part, now I have to defend it 24/7
I don't reccommend taming a Lv.150 with Mejoberries like I did :p
If you are on your own try shooting it with a trank arrow and let it follow you to a safe spot I.e your base so you can tame it safely and you are closer to all your stuff too.
Take more tranqs than doodledex says you need, the intimidation status effect it gives you reduces the amount of torpor it takes per tranq.