Artem Shapiro is a master of creature anatomy, which you can see for yourself once again in his new animation. I'm not sure what it is, but it looks very cool – as expected from a Senior 3D Character Artist at Larian Studios.
Perhaps the most impressive part of the model is its movement: smooth, sure, and slightly threatening.
The motion was set up with Blender's Rigify. One of the most interesting details on the 3D model is the cuts in the neck and other places, helping the creature move like a 3D-printed toy.