We catch these guys at the beach all the time.
Just wait until a wave pulls back out, run and grab a couple of handfulls of sand, flip it and watch for the little guys trying to dig their way back into the sand.
At the Monterey Bay Aquarium (MBA), they had a tank of these guys and you could see them filter feeding. I always thought they were going after detritus (small bits of organic matter), but here you can clearly see them grabbing plankton.
Cool!
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