Easiest way to kill these, especially when with tribe mates, it to use Flyers (Argentavis, Pteradon, Tapajara, ect) to inflict large amounts of melee damage into it (Yes, I mean land and deliver some whoop ass). Otherwise, in caves, you can lure them off the edge into Lava pits.
They are already wrong! It should say something more like:
"Found everywhere but the dark caves of the island, this creature will gladly ruin your day by jumping out and killing you as soon as you even think about going to the swamp. Nearly impossible to tame because it has to be tamed via passive which is very difficult to do. Worst of all you need to feed them fertilized eggs. Why can't it e a little easier?