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The Blanket Octopus:
This species of octopus is able to open its tentacles to reveal a thin and very colorful membrane which spreads out like a "blanket," hence its name. The Blanket Octopus does this to make itself look bigger and to ward off predators.
If that wasn’t strange enough, the blanket octopus has evolved an immunity to the poison of the man-of-war. Not because it was its prey, but so that it could rip off its venomous tentacles and use it against anything that comes to attack it.
Picture by: http://imgur.com/user/IlIlIlIl
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