I’m with @glacial. Everything in nature is weird if you look close enough. I’m not even going to click on that link they provided, because I already have gotten almost no work done today :-p
The first thing that came to mind for me was the thorny devil. It has a very strange method of locomotion! I found out lots of other strange facts on this site, for instance that they “drink” directly from the sand because their skin is permeable, water is also channeled to their mouths by the spikes on their backs, they have a false head to throw off would-be predators, and they use latrines instead of defecating just anywhere!
@Lightlyseared: Wow, that’s fantastic. And here I thought that slime molds had just been invented by RPG designers!