To tame, it's preferable to have a square made out of behemoth gates with ramps that lead well over the gates with a bear trap inside and a few species x on topper of reach of the giga, the bear trap will keep it stuck and you will be able to shut the gate safely. The species x will keep the torpor on the giga from falling while shooting it. Make sure to have a few friends helping out and more than enough tranqs and narcotics with you. Once it's knocked out, put the narcotics in and wait for its torpor to drop low, then spam a few hundred narcotics and you won't have to worry about it waking up in the 2 minutes, but still have someone watching it. If you have the kibble, it's preferable to starve tame it, that way if it wakes up, all you used were narcotics. Make sure when the giga starts to run away, turn off the species x so they won't end up knocking it out because they'll keep shooting it when it falls. Taming a giga is not for uncommitted tribes.
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