I love this pencil test by Frank Thomas. It's very rough but it's full of life. Frank animated very much like this and he would do most of the drawings himself and you wouldn't see lots of charts on his drawings, sometimes no charts at all. To work with his assistants, who would do the final clean drawings, Frank had to have a very close relationship with them and actually those relationships would last many years. One such assistant that Frank had was artist Dale Oliver, who worked with him for 20 years.
Enjoy this beautiful animation.
I forgot that Michael Sporn posted this pencil test a while ago and he's got a better post with lots of more information about it. Please, check his blog out at: www.michaelspornanimation.com