sea urchin

I caught some footage of Echinoecus pentagonus, the crab which lives in the rectums of sea urchins, and spent a couple of hours after the dive reading up on the biology of the animal. A brief mini-review of the crab's biology and evolution is in the video in my narration. Most interestingly...

I taught my pet sea urchin how to use an Olympus TG-4. It did pretty well. Does that show how talented sea urchins are as videographers, or how easy it is to use a modern digital camera?