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In addition to changing color to camouflage against a background, octopuses can also alter the texture of their skin. For example, an octopus that is trying to resemble kelp can use muscles under its skin to raise up papillae into seaweed-like ripples

from Aquaviews - SCUBA Blog

The Nautilus: A Living fossil of the seas

The Nautilus: A Living fossil of the Seas. Found in abundance in prehistoric times, the nautilus’ numbers have dwindled and only a handful of species remain today.

Mollusks are members of the invertebrate phylum Mollusca and contain over one hundred thousand species. Learn more about mollusks at HowStuffWorks.