In "The Premier of Platypus Duck" cartoon, after the duck-billed platypus family is established, a flood comes along and carries off the platypus mom. Thus begins the search for the missing "platypus duchess" by the dad and two sons.
The image above is taken from the POV of a drain pipe which proves to be the method by which the three platypi find a path to the big city. This particular scene was one of the most complicated to execute and shoot. The circle matte moved across the screen from right to left, while the platypi walked through the wooded scenery from left to right.
I particularly like the woodcut look of this background.