They live in the swamp so it will be hard to see them! I recommend taking a friend to be bait for the snakes and you grab the plant x seeds or you can shoot it from long range with a bow or other ranged weapons, these guys are slow and you walk faster than them. But be careful! they can climb up walls. When these guys bite you your topor goes up and they will kill you while your knocked out
The dossier says:
"Found only in the dark caves of the island"
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? Up-vote of you agree!