I bet it never ends
It's stuff like this that makes me proud to be a giant animation fan. The best thing about this is how each and every character has a different and specific design. It's amazing how the colors are so bright. Everyone just walks around in such a fantastically goofy fashion. The music is also pretty good and I really think the music's title is funny. I could just go on all day describing how awesome these guys look.
If you look closely, you'll find that some of them are not even animals. There's a bath tub and an airplane going around at one point. You even get to see some animals or creatures that appear to fully be created from your own imagination. While it has no plot, it certainly doesn't need one. The tone is fairly cheerful, if non-sequitor.