UNDERWATER HIGHLIGHTS - The Best of My Underwater Photography - UnderwaterReflections
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Nudibranch (Indonesia) - Also sometimes called "sea slugs," nudibranchs - whose name means (roughly) "naked lung" - have external gills that are generally located at the back (in this case, the feathery cluster on the left). They come in a wide array of colors, but are often brightly colored as a warning to would-be predators that they are poisonous to eat (similar to the poison frogs of the rainforest).

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