When taming a Giga it's torpor drops in 2min so wait til it's torpor is at about 4,000 then pump a several hundred Narcotics all at once. 100 Narc = 4,000 torpor. It takes longer for the torpor to rise than it does to drop. Took mine 30min to go from 4,000 torpor back to max.
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