The Argentavis appears in the Mountains. Be careful! The Argentavis is aggressive and some of them might attack you on sight. If not, they will attack and follow you, after you attacked them, or if they are in rage because another wild Dinosaur attacked it and u where near it. Many wild Dinosaurs like the TRex seam to have fun attacking them.
Here’s a story for all you bored peeps! So, on Mobile, I had an Argy. Level 78. Her name was Toriel. I brought her EVERYWHERE. We could take down an Alpha Raptor! We’d kill anything that threatened us. But one day... it was the daily quest. A Kill 10 Dimorphodons quest. I thought, ‘Hey, let’s have Toriel help!’. So she did. I’d whistle her attack target on a Dimor, she’d kill it. But then... she began to attack one. They were both circling, trying to catch eachother, like they do. They went higher, and higher, and higher... I never saw Toriel again. She never died. She never landed. I searched day and night... but I never saw her again. #Pray for Toriel