The most easily accessible way for an average tribe to tame these is with regular cooked meat. If you can get cooked prime, that will take longer, but will give more taming effectiveness. Cooked meat in general is better than raw prime for this one, and cooked primes are better than cooked meat, and cooked mutton is better than both.If you try to tame this with raw meat, you better find a comfy seat.
The redwoods are now basically a no fly zone, I lost a quetz, and a pter to these bastards. They jump out of the tree, rip you off your mount, and then pin you and your mastercraft armor to the ground and murder you.
Easiest way to tame: make a dino pen, pick one up with an argy, put it in the dino pen then follow along with a basic taming process (knock it out, feed it). Make sure you have lots of narcotics on you!
Best thing about them: they can climb up really steep hills and they can potentially do lots of damage and can be fast.
Where to find: most commonly found on trees (they will be hanging upside down, high up on large trees) in the redwood forest areas (mainly on The Center) or I find lots of them in the Ragnorok desert.
If your on Ragnarok, I suggest taming them in the desert, in my opinion its alot less dangerous b/c the thylas are on the ground. Make sure to go on a flying mount and watch out for rock golems and other bugs. The thylas are near the bottom of the desert.