I would recommend going to the green obolisk to know I one out! If you have an Argentavis, definitely bring that, also be sure it has high health/melee damage, because there are lots of theris at the obolisk, and if you really want that theri ya got, then ya might just wanna kill off some of the others before they kill you.

Also, if you are on mobile, swipe down to collect berries/ wood and swipe up to do the theri’s 2nd attack!