Starfish Time Lapse


(Vimeo link)

Have you ever seen a starfish move? I haven’t either. This time-lapse video shows they don’t quite walk on their arms they way you’d expect! Note: The first scene shows barnacles and tiny snails. -via Ursi’s Blog

Fleshy starfish like this one move by thousands of tiny tube feet on their underside. It's almost as if each arm is a millipede, but the millipede legs end in suction cups. The overall effect of their locomotion is a gliding movement. Here's a good YouTube look at the tube feet underneath:
http://youtube.com/watch?v=4IRF-pKVtuU

Brittle stars, skinnier starfish relatives, do move more by walking with their legs.
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The main place I've found starfish is tide pools. Not exactly current-filled.

But to me it looks like these starfish arent underwater at all, at least near the end.
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Hi. I made this time lapse. It was filmed outside on rocks that created something like tidal pools. Mostly just rocks covered in seaweed, barnacles, snails and other critters. Its difficult to see that the orange sea star comes about half out of water in its shot, and then goes back under again. I used a polarizer to cut glare off the water. I'm also surprised that the lighting came out so well, but it was a clear blue sky that day, so the light was steady, giving the appearance of indoor lighting. Not done in an aquarium though!
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