Nudibranch
The soft sea slugs known as nudibranchs have no shells and are defenseless from predators—or so it would seem. In fact the animals boast a toxic arsenal acquired by producing their own poisons or by ingesting them with meals of toxic sponges or anemones and then secreting them when threatened. Many nudibranchs boast brilliant color palettes that make them stand out on reefs or ocean floors and send would-be predators a clear message: I am not tasty.
(source:google/http://ocean.nationalgeographic.com/)
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