Question about clam mobility

[CeCe803]

I got a nice 3" squamosa a few days ago - put him in what I thought was a good spot. Well, in those couple of days, he's done some trucking.
In this pic,he started out at the top of substrate area you can see in the middle, perpendicular (thank God for spell check lol) to the front of the tank. Now as you can see he rounded the corner and is parallel to the glass:

How is he doing this?? Reminds me of the old BC comic where after finding some clams walking around on the beach, he runs around yelling "Clams got legs!"
:lol:

 

[Ninong]

I don't have any Tridacna squamosa clams but I do have three T. maxima and two T. crocea. My clams have two different methods of locomotion. They can move by rocking back and forth and by rapidly closing their shell expelling water -- jet propulsion. The rocking motion is employed when they want to rearrange the rock structure and the jet propulsion method, which results in a jumping movement, is used to jump off their rock onto another rock or even a hapless coral or other sesile invertebrate.

According to Daniel Knop, they move because they aren't happy about something. Could be direction of the current flow, could be lighting, could be water parameters, could be proximity to unruly neighbors, etc.

 

[Sloth]

I've found that my maxima will scoot along by pushing himself across the sand with his "foot" (bysall organ?). Those things can extend really far.