I have no idea when this short National Geographic web exclusive on Hulu.com will last, but it's here now:
I'm a big fan of molluscs, I find them endlessly fascinating. (I also find them occasionally tasty. I'm about 99% vegetarian, but small bivalves rock my culinary world.)
I didn't really know much about giant clams. I guess I assumed that they lived in the deep sea (they don't), and that they were a lot like large versions of normal clam species. But they have nifty skin not unlike a squid's (less shiftingly chromatophoric*), and I had no idea about their relationship with algae!
Also, let it be said that the diver at the end of this clip is a doofus. Don't go messing with sea animals or coral reefs, Doofus Diver.
*It's amazing what blogger labels as incorrectly spelled. What, that's not a word?