Octopuses are fascinating creatures. The effect highlighted in the video makes the audience audibly gasp. For a species with few offensive capabilities, camouflage is its primary form of defense against predators. According to the Smithsonian Institute, octopuses have thousands of cells called chromatophores that allow them to quickly change the color of their skin to blend in with their surroundings. 

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In addition to skin color, octopuses can also match the texture of their surroundings by changing the projections on their skin to look like nearby algae or rocks. With these techniques, an octopus can quickly create an almost perfect camouflage. Take a look at the video below to see the effect in slow motion. Could you detect the octopus? Let me know what you think in the comments below.