The easier method is with an argie. you need to build a jail for him out of redwood, because it is very dangerous to build there. An 1×1 jail is good, but hard to put him in it, so a 2×2 is better. Thylas can't break stone, and use doorframes, it's cheaper. Then, fly on redwood with an argie (BE CAREFUL, THEY CAN GRAB YOU BY JUMPING FROM TREES, AND IT DEALS A LOOOOOT OF DAMAGES, SO FLY ABOVE THEM) when you find the one you want, make him fall by attacking him. When he's down, you can grab him with argie, and place him in the trap. Knock him down and give him cooked meat. Yes, cooked meat. You have now the coolest creature in ark.

Hope it will help :D