To help myself with rigging my dinosaur properly i downloaded a nice, professional dino with a nice rig. I found out in it the thing i don't understand. There's a parent-child chain: chest -> neck -> head -> jaw and there's no bone constraints on any of those bones... and somehow you move the head and the neck follows. It works like IK and it's very smooth and it's comfortable but i have no idea how it's done, despite of having the .blend file.
My question is: how to do this?