Big tip: when you are knocking the giga out, you will see that when you shot all the arrows it takes some time for him to be unconscious because of the tons of torpor that's still raising. I didn't know that while taming one and I had to go back to base and I had to take some more arrows while it was not necessary.
I dare you to raise one!! They are savage if you got two high lvl parents (about lvl 140ish) and you get imprinting on it. The thing will become an adult with about 230% melee and basically one chomp any bronto!!! But on the down side you loose your job and your girlfriend
Make 4 metal dino gates and 1 large bear trap. Place three frames and door into an incomplete square and the large bear trap in the I between them. Lure the Giga into the trap and while its trapped place 4th down to make the square. Then just light it up with tranqs