The best way to tame a giganotosaurus is to make 4 metal gateways and a large bear trap have two people one to make it follow him into the trap and one to place down the final gateway behind the giga this can also be done with 1 player but is dangerous.
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