I'm not sure what to think about this, but if you like Monkeys dressed up as Cowboys, with animated mouths, have I got a short film for you! I came across it on Youtube, and although I didn't feel like watching it, I did....and found it thoroughly entertaining! Its called the Lonesome Stranger, and DrowningKittens on Youtube has this to say about it:
Howdy, Pardner! Are you ready for some rootin'-tootin' good ol'-fashioned cowboy fun? What about if'n them cowboys is a bunch of monkeys - all dressed up for a high noon shootout? How about if'n them monkeys ride dogs instead of horses? Yessir, that would be somethin'. Well, that day's done come, my friend - The Lonesome Stranger (1946 - part of the Speaking of Animals series) shows us what life would be like if talking monkeys tamed the Wild West.
I seem to remember, when I was younger, seeing an all animal version of Swinging on a Star, where the Monkey who was "singing" the song has a mouth very much like these Monkeys have.
Regardless, here it is, in all its Weird West Simian goodness!
EDIT: The link to the program seems to have died (due to copyright claims which seems weird for something that came out in the 30's) so until I can find another version of the film here is a Taco John's commercial that feels like it was directly inspired by the "The Lonesome Stranger: All Monkey Western":