What can starfish do that other marine animals Cannot? starfish move using a water vascular system which sucks water through to their tubed feet which means their tubed feet can suck on to things. Starfish are equipped with hundreds of tiny little feet at the end of each arm. The special feature of the echinoderms and also the starfish is their calcareous skeleton, which protects the body. Typical for starfish is that they have no head and their body also has no front and rear end: Rather, they have a disc-shaped body with several arms. The common starfish has five arms and a diameter of up to 30 centimeters. How does a starfish move AddThis Advanced Settings above via filter on get_the_excerpt -->