How to tame.

How to tame is easy: first find one that has 2300 health. Then get 40 to 50 tranq arrows (I only used 30).

Then shoot then run then shoot then run and keep doing it.

Then when it falls get some bio toxin and narcotics.

Use mejoberries or amarbarreis or azzullberries.

Then wait a while (I did lots of things while waiting) then there you go! I hope this helped! (My bronto aka apatasuarus is named Fred)