How to make changes to mesh after animating I have animated a bird. However I forgot to add eyes so I want to add them now, but when I change from Edit mode to  Object mode in order to add new eyes the bones, the bird itself gets deformed to pose animation, leaving eyes behind.
Edit Mode: 
Object Mode:
I watched https://www.youtube.com/watch?v=R2fx8TMQDoc and it help me to attach eyes to body itself, but I had to put eyes higher in mesh to make it good in animation. Tell me please if you know how to put them the right way.