The blue ring octopus is among the most venomous creatures in the world; its bite is usually lethal even to a large adult. However, this little octopus is tiny -- no larger than man's thumb -- and not at all aggressive. It prefers to be unnoticed; if that fails, it will flee (though like many poisonous creatures, it usually does so in a relatively sedate manner). Like other species, this little octopus changes color to match its surroundings (or possibly reflect its emotional state)....
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