I very easy way to knock out the giganotosaurus is to find a good area you would like to tame him in then kite him close to the area. Once that is done do a U shape with small metal gateways(no doors required). Put a large bear trap in the middle, kite the giga into the cube and he will get stuck on the bear trap for roughly 10seconds, quickly fly around the giga to the back but nake sure your out of his bite range because it can be deadly, then place the last metal gate closing up the u shape and making it a square . After you finish traping him you need to knock him out from a far distance away for from a qeutzal platform,which i usually perfer. After you knock him out make sure to pump him full of narcs after a minute or two ir he will wake up.

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