Dispite how effective these things ambush is, it abides by a few simple rules that allows you to dodge a thylacoleo attack.

1. Wild thylos in ambush position have no gravity. When a wild thylo jumps at you it can go forever at a constant speed and can even jump at things flying above it. When a thylo is tamed it cannot do this and will eventually fall to the ground. Flying away in the same direction that the thylo is jumping is not an option as this zero gravity affect will last until you are out of range of the thylo.

2. Thylacoleos lead their targets. If you are moving fast through a thylo's targeting range it will jump ahead of you to compensate for the time it takes for them to get to you.

3. Thylacoleos cannot change speed or direction of a jump. The only movement a thylo can make while airborn is a rotation. Since it leads targets, stopping as soon as you hear a thylo causes it to miss as it plummets to the location it thought you would go to. This wont work if your tame is slow.

4. Thylacoleos prioritize the closest prey in this order: player/small wild dino, small tamed dino, passenger. Sitting in the passenger seat of a dino won't usually help as the thylo can rip the mount from under you and target it instead.

5. Thylacoleos can share trees. It is rare but thylacoleos can be in the same tree or in adjacent trees. This is the worst thing to happen to you in a redwood forrest as both thylos can jump at you, one snagging you and the other grabbing your tame. That being said, if one jumps at you don't relax because there could be another one close by.

6. Thylacoleos will only be in ambush position on the bark parts of large redwood trees. You will never see a thylacoleo climb a tree or ambush you from the leaves of a tree. They will also only climb a tree when out of render distance.

With these rules in mind: if you have a slower tame, a thylo will not lead enough where you can dodge it. Have your flyer on passive and come back to collect it. If your tame is relatively fast you can dodge it by flying out of its path (under, over, strafe). Make sure to not fly directly at trees so that they don't have a straight shot to you. Any land based tames have on neutral and be sure they can kill a thylo in two hits or so.

Stay safe.

So after hearing about things in the redwoods that take you off your mount I went flying about for literally days with no issue what so ever, I’m thinking what’s the big deal? I start hunting for some prime meat and hide to take back to base in time for imprinting and suddenly out of nowhere I’m flying backwards off my argent and am chomped by this guy, lvl 10, I fight back and get released, I am lvl 98, tho I’m quickly killed before I can draw my mastercraft crossbow. My only imprinted bird and my xbow are now with my corpse near the edge of the redwood. My lvl 220 spino munched the tree hugger and I got my bird back after a second trip back to search. Moral of the story, these guys are legit savage and need be tamed ASAP

If you have a rhynio you can easily tame without any bear traps (it will run away when low so you might as well have some bear traps u can still chase it while shooting) just try to get the thyla down the big tree and then while mounted on your rhynio look down fully to the floor then in the air start shooting it with whatever you are using and then when it's knocked out just feed him (skill issue if you lose the rhynio or die btw u can us a big dino or small better bog dino as bait to get it to leave the tree.)