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Nudibranch are known to be slow crawler and at times, they can be found hardly moving either resting stationery or when laying eggs. And sometimes, they collected hitch-hiker as in this pic, an Emperor Shrimp - Zenopontonia rex, previously known as Periclimenes imperator). The Shrimp benefits by getting a free ride and when they needs to feed, they will go to the edge of the Nudibranch and picking up food from the bottom as can be seen in Pic#2.