I love to take mine into the water with me when I get pearls in rivers and shallow oceans. Whistle follow one and they stay with you under water. Just keep an eye on the oxygen level. Great easy and fast way to get pearls.
Thylacoleo are capable of pinning down flyers in mid-flight (anything but the Quetz and Wyvern, I believe), other Thylacoleo, and even Therizinos. You can also jump from object to object by holding down the jump button while pouncing from a tree or cliff (have to hit it at the right angle, however). Upvote to inform others!