The mimic octopus (Thaumoctopus mimicus) is a species of octopus located throughout the Indo-Pacific, particularly in Indonesia. They grow to be about 2 feet in length and generally inhabit shallower waters near the mouths of rivers or estuaries. Although they are naturally a muddy brown color, they have the ability (like many other octopuses) to change colors to blend in or stand out, depending on the situation.
What makes the mimic octopus so truly unique, however, is its ability to successfully mimic a wide range of other species in its local habitat. Anecdotal evidence suggests it knows how to mimic at least 15 different sea creatures, though the full extent of its repertoire remains currently unknown. Although it uses mimicry primarily as a defense mechanism to scare away potential predators by pretending to be something much deadlier like a sea snake, lion fish or jellyfish, it can also use it for aggressive purposes such as imitating a potential mate for an unwitting crab.
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