Their teeth, eyes and some elements on the wings keep disappearing in and out depending on your distance, viewing angle or even camera zoom levels. The problem is noticeable from as little as 20 yards. Sorry for the poor examples but sometimes based on a (sub)zone this does not happen and might have something to do with the Skybox. Both screenshots are cropped and were taken from the same distance of around 80y but with minimal difference in mouse wheel zoom level. The game is running on 1080p with high textures and settings.
https://i.imgur.com/XQfLH3k.jpg
https://i.imgur.com/UClY3NG.jpg