S is for Symbiosis
One of Nate's hobbies is caring for saltwater fish. We have 2 tanks, a 55 gallon long tank and a 30 gallon tank.
One of the coolest inhabitants I think is this Condylactus anemone. The little Porcelain Crab lives symbiotically with the anemone, never leaving him. He cleans the 'nem, eats the same food as the 'nem, and basically hangs out with him all the time.
Pretty neat, I think. (Click for big 'nem pic).
You may have seen Finding Nemo, and remember that Clown Fish also live symbiotically with anemones. This is true. But, they won't live with any species; only with host species, of which the Condylactus is not.
Our two little Ocellaris clown fish, Scratch and Patch, pretty much hang out together all the time, they're probably a mated pair, the female being the larger and more dominant of the two.
Hanging out with Scratch and Patch is Sunflower, the Hawaiian Yellow Tang (my favorite). Nate took the smaller tank to his 7th grade biology class last year, and might again this year, the kids really liked it.