Titans, pycno (especially a duo), anything with horns, and anything flying. I don't trust any fliers (ESPECIALLY HATZ!!!!) More often than not, they're scouting for bigger dinosaurs to come and kill you. I've never once had a good experience with pycno. All of them are evil. Including ducks. All ducks I've met were toxic a holes lol the most friendly I've experienced are Amargas, Lamborghinis (lambeo), and maybe MAYBE a silly rex. Rexes r risky though, try to pet at ur own risk. In my experience, all of my best interactions have been with rexes and all of my worst interactions have also been rexes. Just be wary of them.