Clips can't do this movie justice. Seriously. It is a transcendent piece of work. And it was meant to be 100% serious. The actors weren't even paid until the film starting getting some cult popularity and the company releasing the DVD gave them all the money they were owed by the director.
One of the related videos has the director claiming that he had to assure the ASPCA that there were no actual birds harmed during the filming, that they were all "digital characters."