Simple, maybe... but too much for me...

OK,

This will be (I think) my first official post.

I am learning the basics, and I am trying to create a muppet in 3d.

I have the modeling down, my question is, and picture this....

If you have a ball, with a wedge removed for the mouth, how do you
work the mesh so that I can open and close the mouth?  what do I have
to do to make this work?

Thanks,

-Steve