Thylacoleos are GOATED in PvP. They can swim fast to catch other players or players mounted on games in the water, they can climb to avoid stronger creatures, they can pounce and pin down people, as well as knock them off their flyer, and the bleed does percentage damage so killing stuff like Titanosaurs are much easier. However, as I have learned by another tip someone else left, if you kill anything due to bleeding damage instead of direct attacks, you won’t get the XP. (Correct me if I’m wrong) You can pick them up with Argentavis and some other flyers I think.