I only ever saw this film on a VHS tape I had as a child, likely from the late 80s-early 90s. The lead character was a puppet with a long mustache, I believe he was a scientist or professor. The one song that is clear in my head would zoom in on different animals and tell you what they did: I remember specifically a duck, a spider, and a pig. And it was all done with puppets.
This is driving me crazy! Hopefully someone can remember.