I was exploring on my Maewing (Velvet), and decided that I wanted to take my Sinomacrops (Monarch) for a spin. Left Velvet at the bottom of the Sino ravine and scaled the walls. Had a great glide, but when I came back, Velvet was gone. Turns out one of these frickers tranqed her. She died right when I got to her, and the Titanoboa turned towards me. I promptly shut off the Xbox. When I loaded in next time, it had never happened. Moral of the story is to keep an eye on your Maewings, especially around Troodons or Titanoboas. And, when in doubt, turn off the console without saving.🙃