interesting idea, but...
It's WAY too short. The artwork was pretty nice, but everything happened far too quickly. Perhaps you could've made it longer by having the bird stalk the 'worm' for awhile, have the bird dramatically build up some strength, and then... well, the whole joke. Also, for the note at the end, I felt two major flaws:
1) It went by way too fast, and just kinda cut off to the preloader.
2) It kinda ruins the whole setup. It would probably be better to cut it out altogether.
All in all, it's a very clever idea, but it just needs a bit more work.