Pretty sure, I've posted this before, but it's worth another watch.

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Spanish Dancer

Here is a video of a spanish dancer that my friend and I encountered in the shallows of Lanikai Beach. A spanish dancer is a large nudibranch that can undulate in the water to move from place to place.  The movement of the swimming is said to be reminiscent of a flamenco dancer, hence the name spanish dancer.

So cool!

awesome