Many armed sunflower stars are incredibly colorful, especially when viewed up close. They have all kinds of pokey parts to keep barnacles and algae from growing on them and the fuzzy stuff on top that makes them feel somewhat slimy is their gills. They have thousands of tube feet, that suction them along the ocean floor. They can actually move quite fast and are voracious predators. A cockle (clam) will flip itself away if you put it in the same tank with a sunstar.