If u just started ark and tamed some dodos and see a rex rushing at u just grab ur dodo and yeet it at the rex and run

Since when can Rex's climb cliffs like spider man

If you run into one of these, stand perfectly still. Rexes can’t see you if you don’t move. I saw it in a movie once.

Bring a wooden club and a dodo

When on the island near the tundra they will spawn but its nice to bring a powerful Dino because they sometimes can’t spawn because too many other dinos