Uh, the missing link? Um, small duck going after large carnivorous worm? Is there a coffee stand nearby so at least people can enjoy a nice cup of joe while trying to figure it out?
Maybe, it's the artist's commentary of the angst of modern existence: the inevitable dichotomy between man's id and ego; the frustrations of the impossibility of adequately blending the spirit with the soul.
There's a lot of that stuff going on these days. Then again, maybe it's really just the artist's attempt to get people to go: "Huh?"